Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 131
Filtrar
1.
Cereb Cortex ; 33(11): 6633-6647, 2023 05 24.
Artigo em Inglês | MEDLINE | ID: mdl-36721890

RESUMO

The common intersection of autism and transgender identities has been described in clinical and community contexts. This study investigates autism-related neurophenotypes among transgender youth. Forty-five transgender youth, evenly balanced across non-autistic, slightly subclinically autistic, and full-criteria autistic subgroupings, completed resting-state functional magnetic resonance imaging to examine functional connectivity. Results confirmed hypothesized default mode network (DMN) hub hyperconnectivity with visual and motor networks in autism, partially replicating previous studies comparing cisgender autistic and non-autistic adolescents. The slightly subclinically autistic group differed from both non-autistic and full-criteria autistic groups in DMN hub connectivity to ventral attention and sensorimotor networks, falling between non-autistic and full-criteria autistic groups. Autism traits showed a similar pattern to autism-related group analytics, and also related to hyperconnectivity between DMN hub and dorsal attention network. Internalizing, gender dysphoria, and gender minority-related stigma did not show connectivity differences. Connectivity differences within DMN followed previously reported patterns by designated sex at birth (i.e. female birth designation showing greater within-DMN connectivity). Overall, findings suggest behavioral diagnostics and autism traits in transgender youth correspond to observable differences in DMN hub connectivity. Further, this study reveals novel neurophenotypic characteristics associated with slightly subthreshold autism, highlighting the importance of research attention to this group.


Assuntos
Transtorno do Espectro Autista , Transtorno Autístico , Pessoas Transgênero , Recém-Nascido , Humanos , Adolescente , Feminino , Encéfalo/diagnóstico por imagem , Mapeamento Encefálico/métodos , Transtorno do Espectro Autista/diagnóstico por imagem , Imageamento por Ressonância Magnética/métodos , Vias Neurais/diagnóstico por imagem
2.
J Clin Child Adolesc Psychol ; 51(5): 675-687, 2022.
Artigo em Inglês | MEDLINE | ID: mdl-32189525

RESUMO

Objective: Selective or "picky" eating (SE) refers to rejection of a wide range of familiar and unfamiliar foods based on aversions to their sensory properties. When severe, SE can cause symptoms of avoidant/restrictive food intake disorder (ARFID), including weight loss, nutritional deficiencies, and/or psychosocial impairment. SE is highly prevalent in autism spectrum disorder (ASD) compared to both typical development and other developmental disorders. A possible explanation for the high prevalence of SE in ASD is the effect of core ASD symptoms, repetitive/restrictive behaviors (e.g., rigidity), and sensory sensitivity on feeding behaviors. These traits are found not only in ASD but also in other clinical groups and the general population, albeit often at subclinical levels. Identifying mechanisms of SE across various populations is critical to inform intervention approaches.Methods: In 263 unselected children ages 5-17, 534 unselected college students ages 18-22, 179 children with anxiety/obsessive spectrum disorders ages 5-17, and 185 children with ASD ages 4-17, we explored the unique contributions of sensory (i.e., oral texture and olfactory) sensitivities and rigidity as predictors of self/parent-reported SE.Results: In each sample, rigidity and oral texture sensitivity, controlling for olfactory sensitivity, age, and gender, emerged as significant, independent predictors of SE.Conclusions: This is the first study to highlight the importance of cognitive/behavioral rigidity to SE, and one of the first to illustrate the domain-specificity of the relationship between sensory sensitivity and SE.


Assuntos
Transtorno do Espectro Autista , Transtornos da Alimentação e da Ingestão de Alimentos , Adolescente , Transtorno do Espectro Autista/psicologia , Criança , Pré-Escolar , Humanos , Prevalência , Estudantes , Adulto Jovem
3.
J Neurosci ; 39(16): 3028-3040, 2019 04 17.
Artigo em Inglês | MEDLINE | ID: mdl-30833512

RESUMO

The genetics of cortical arealization in youth is not well understood. In this study, we use a genetically informative sample of 677 typically developing children and adolescents (mean age 12.72 years), high-resolution MRI, and quantitative genetic methodology to address several fundamental questions on the genetics of cerebral surface area. We estimate that >85% of the phenotypic variance in total brain surface area in youth is attributable to additive genetic factors. We also observed pronounced regional variability in the genetic influences on surface area, with the most heritable areas seen in primary visual and visual association cortex. A shared global genetic factor strongly influenced large areas of the frontal and temporal cortex, mirroring regions that are the most evolutionarily novel in humans relative to other primates. In contrast to studies on older populations, we observed statistically significant genetic correlations between measures of surface area and cortical thickness (rG = 0.63), suggestive of overlapping genetic influences between these endophenotypes early in life. Finally, we identified strong and highly asymmetric genetically mediated associations between Full-Scale Intelligence Quotient and left perisylvian surface area, particularly receptive language centers. Our findings suggest that spatially complex and temporally dynamic genetic factors are influencing cerebral surface area in our species.SIGNIFICANCE STATEMENT Over evolution, the human cortex has undergone massive expansion. In humans, patterns of neurodevelopmental expansion mirror evolutionary changes. However, there is a sparsity of information on how genetics impacts surface area maturation. Here, we present a systematic analysis of the genetics of cerebral surface area in youth. We confirm prior research that implicates genetics as the dominant force influencing individual differences in global surface area. We also find evidence that evolutionarily novel brain regions share common genetics, that overlapping genetic factors influence both area and thickness in youth, and the presence of strong genetically mediated associations between intelligence and surface area in language centers. These findings further elucidate the complex role that genetics plays in brain development and function.


Assuntos
Córtex Cerebral/diagnóstico por imagem , Lateralidade Funcional/genética , Inteligência/genética , Adolescente , Mapeamento Encefálico , Criança , Feminino , Testes Genéticos , Humanos , Imageamento por Ressonância Magnética , Masculino , Tamanho do Órgão/genética , Gêmeos/genética
4.
Brain ; 142(3): 808-822, 2019 03 01.
Artigo em Inglês | MEDLINE | ID: mdl-30698656

RESUMO

Conversation is an important and ubiquitous social behaviour. Individuals with autism spectrum disorder (autism) without intellectual disability often have normal structural language abilities but deficits in social aspects of communication like pragmatics, prosody, and eye contact. Previous studies of resting state activity suggest that intrinsic connections among neural circuits involved with social processing are disrupted in autism, but to date no neuroimaging study has examined neural activity during the most commonplace yet challenging social task: spontaneous conversation. Here we used functional MRI to scan autistic males (n = 19) without intellectual disability and age- and IQ-matched typically developing control subjects (n = 20) while they engaged in a total of 193 face-to-face interactions. Participants completed two kinds of tasks: conversation, which had high social demand, and repetition, which had low social demand. Autistic individuals showed abnormally increased task-driven interregional temporal correlation relative to controls, especially among social processing regions and during high social demand. Furthermore, these increased correlations were associated with parent ratings of participants' social impairments. These results were then compared with previously-acquired resting state data (56 autism, 62 control subjects). While some interregional correlation levels varied by task or rest context, others were strikingly similar across both task and rest, namely increased correlation among the thalamus, dorsal and ventral striatum, somatomotor, temporal and prefrontal cortex in the autistic individuals, relative to the control groups. These results suggest a basic distinction. Autistic cortico-cortical interactions vary by context, tending to increase relative to controls during task and decrease during test. In contrast, striato- and thalamocortical relationships with socially engaged brain regions are increased in both task and rest, and may be core to the condition of autism.


Assuntos
Transtorno do Espectro Autista/fisiopatologia , Relações Interpessoais , Comportamento Verbal/fisiologia , Adolescente , Adulto , Transtorno Autístico/fisiopatologia , Encéfalo/fisiopatologia , Mapeamento Encefálico/métodos , Comunicação , Humanos , Imageamento por Ressonância Magnética/métodos , Masculino , Vias Neurais/fisiopatologia , Córtex Pré-Frontal/fisiopatologia , Descanso , Comportamento Social , Habilidades Sociais , Adulto Jovem
5.
Epilepsy Behav ; 102: 106825, 2020 01.
Artigo em Inglês | MEDLINE | ID: mdl-31816479

RESUMO

OBJECTIVE: Structural brain differences are found in adults and children with epilepsy, yet pediatric samples have been heterogeneous regarding seizure type, magnetic resonance imaging (MRI) findings, and hemisphere of seizure focus. This study examines whether cortical thickness and surface area differ between children with left-hemisphere focal epilepsy (LHE) and age-matched typically developing (TD) peers. We examined whether age differentially moderated cortical thickness between groups and if cortical thickness was associated with duration of epilepsy, seizure frequency, or neuropsychological functioning. METHODS: Thirty-five children with LHE and 35 TD children completed neuropsychological testing and 3T MR imaging. Neuropsychological measures included general intelligence and executive functioning. All MRIs were normal. Surface-based morphometric processing and analyses were conducted using FreeSurfer 6.0. Regression analyses compared age by cortical thickness differences between groups. Correlational analyses examined associations between cortical thickness in these areas with neuropsychological functioning or epilepsy characteristics. RESULTS: Left-hemisphere focal epilepsy displayed decreased cortical thickness bilaterally compared to TD controls across 6 brain regions but no differences in surface area. Moderation analyses revealed quadratic relationships between age and cortical thickness for left frontoparietal-cingulate and right superior frontal regions. Higher performance intelligence quotient (IQ) (PIQ) and verbal IQ (VIQ) and fewer parent reported executive function problems were associated with greater cortical thickness in TD children. SIGNIFICANCE: Children with LHE displayed thinner cortex extending beyond the hemisphere of seizure focus. The nonlinear pattern of cortical thickness across age occurring in TD children is not evident in the same manner in children with LHE. These differences in cortical thickness patterns were greatest in children 8-12 years old. Greater cortical thickness was associated with higher IQ and fewer executive control problems in daily activities in TD children. Thus, differences in cortical thickness in the absence of differences in surface area, suggest cortical thickness may be a sensitive proxy of subtle neuroanatomical changes that are related to neuropsychological functioning.


Assuntos
Córtex Cerebral/patologia , Disfunção Cognitiva/fisiopatologia , Epilepsias Parciais/patologia , Epilepsias Parciais/fisiopatologia , Função Executiva/fisiologia , Inteligência/fisiologia , Adolescente , Adulto , Córtex Cerebral/diagnóstico por imagem , Criança , Disfunção Cognitiva/etiologia , Epilepsias Parciais/complicações , Epilepsias Parciais/diagnóstico por imagem , Feminino , Humanos , Imageamento por Ressonância Magnética , Masculino , Testes Neuropsicológicos
6.
J Int Neuropsychol Soc ; 24(9): 917-927, 2018 10.
Artigo em Inglês | MEDLINE | ID: mdl-30375320

RESUMO

OBJECTIVES: Past research suggests that youth with sex chromosome aneuploidies (SCAs) present with verbal fluency deficits. However, most studies have focused on sex chromosome trisomies. Far less is known about sex chromosome tetrasomies and pentasomies. Thus, the current research sought to characterize verbal fluency performance among youth with sex chromosome trisomies, tetrasomies, and pentasomies by contrasting how performance varies as a function of extra X number and X versus Y status. METHODS: Participants included 79 youth with SCAs and 42 typically developing controls matched on age, maternal education, and racial/ethnic background. Participants completed the phonemic and semantic conditions of a verbal fluency task and an abbreviated intelligence test. RESULTS: Both supernumerary X and Y chromosomes were associated with verbal fluency deficits relative to controls. These impairments increased as a function of the number of extra X chromosomes, and the pattern of impairments on phonemic and semantic fluency differed for those with a supernumerary X versus Y chromosome. Whereas one supernumerary Y chromosome was associated with similar performance across fluency conditions, one supernumerary X chromosome was associated with relatively stronger semantic than phonemic fluency skills. CONCLUSIONS: Verbal fluency skills in youth with supernumerary X and Y chromosomes are impaired relative to controls. However, the degree of impairment varies across groups and task condition. Further research into the cognitive underpinnings of verbal fluency in youth with SCAs may provide insights into their verbal fluency deficits and help guide future treatments. (JINS, 2018, 24, 917-927).


Assuntos
Aneuploidia , Cromossomos Humanos X/genética , Cromossomos Humanos Y/genética , Aberrações dos Cromossomos Sexuais , Comportamento Verbal , Adolescente , Criança , Feminino , Humanos , Testes de Inteligência , Transtornos da Linguagem , Masculino , Testes Neuropsicológicos , Desempenho Psicomotor , Semântica , Adulto Jovem
7.
Proc Natl Acad Sci U S A ; 112(48): E6699-706, 2015 Dec 01.
Artigo em Inglês | MEDLINE | ID: mdl-26627261

RESUMO

Although typically identified in early childhood, the social communication symptoms and adaptive behavior deficits that are characteristic of autism spectrum disorder (ASD) persist throughout the lifespan. Despite this persistence, even individuals without cooccurring intellectual disability show substantial heterogeneity in outcomes. Previous studies have found various behavioral assessments [such as intelligence quotient (IQ), early language ability, and baseline autistic traits and adaptive behavior scores] to be predictive of outcome, but most of the variance in functioning remains unexplained by such factors. In this study, we investigated to what extent functional brain connectivity measures obtained from resting-state functional connectivity MRI (rs-fcMRI) could predict the variance left unexplained by age and behavior (follow-up latency and baseline autistic traits and adaptive behavior scores) in two measures of outcome--adaptive behaviors and autistic traits at least 1 y postscan (mean follow-up latency = 2 y, 10 mo). We found that connectivity involving the so-called salience network (SN), default-mode network (DMN), and frontoparietal task control network (FPTCN) was highly predictive of future autistic traits and the change in autistic traits and adaptive behavior over the same time period. Furthermore, functional connectivity involving the SN, which is predominantly composed of the anterior insula and the dorsal anterior cingulate, predicted reliable improvement in adaptive behaviors with 100% sensitivity and 70.59% precision. From rs-fcMRI data, our study successfully predicted heterogeneity in outcomes for individuals with ASD that was unaccounted for by simple behavioral metrics and provides unique evidence for networks underlying long-term symptom abatement.


Assuntos
Transtorno do Espectro Autista/fisiopatologia , Imageamento por Ressonância Magnética , Adolescente , Adulto , Comportamento , Encéfalo/fisiologia , Mapeamento Encefálico , Córtex Cerebral/fisiopatologia , Criança , Pré-Escolar , Cognição , Feminino , Seguimentos , Giro do Cíngulo/fisiopatologia , Humanos , Aprendizado de Máquina , Masculino , Vias Neurais/fisiologia , Análise de Regressão , Reprodutibilidade dos Testes , Fatores de Tempo , Adulto Jovem
8.
Cereb Cortex ; 26(1): 70-9, 2016 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-25146371

RESUMO

Owing to their unique evolutionary history, modern mammalian X- and Y-chromosomes have highly divergent gene contents counterbalanced by regulatory features, which preferentially restrict expression of X- and Y-specific genes. These 2 characteristics make opposing predictions regarding the expected dissimilarity of X- vs. Y-chromosome influences on biological structure and function. Here, we quantify this dissimilarity using in vivo neuroimaging within a rare cohort of humans with diverse sex chromosome aneuploidies (SCAs). We show that X- and Y-chromosomes have opposing effects on overall brain size but exert highly convergent influences on local brain anatomy, which manifest across biologically distinct dimensions of the cerebral cortex. Large-scale online meta-analysis of functional neuroimaging data indicates that convergent sex chromosome dosage effects preferentially impact centers for social perception, communication, and decision-making. Thus, despite an almost complete lack of sequence homology, and opposing effects on overall brain size, X- and Y-chromosomes exert congruent effects on the proportional size of cortical systems involved in adaptive social functioning. These convergent X-Y effects (i) track the dosage of those few genes that are still shared by X- and Y-chromosomes, and (ii) may provide a biological substrate for the link between SCA and increased rates of psychopathology.


Assuntos
Encéfalo/anatomia & histologia , Cromossomos Humanos X , Cromossomos Humanos Y , Adolescente , Adulto , Aneuploidia , Criança , Evolução Molecular , Feminino , Humanos , Masculino , Adulto Jovem
9.
J Neurosci ; 35(1): 140-5, 2015 Jan 07.
Artigo em Inglês | MEDLINE | ID: mdl-25568109

RESUMO

The human brain displays stereotyped and early emerging patterns of cortical asymmetry in health. It is unclear if these asymmetries are highly sensitive to genetic and environmental variation or fundamental features of the brain that can survive severe developmental perturbations. To address this question, we mapped cortical thickness (CT) asymmetry in a group of genetically defined disorders known to impact CT development. Participants included 137 youth with one of five sex-chromosome aneuploidies [SCAs; XXX (n = 28), XXY (n = 58), XYY (n = 26), XXYY (n = 20), and XXXXY (n = 5)], and 169 age-matched typically developing controls (80 female). In controls, we replicated previously reported rightward inferior frontal and leftward lateral parietal CT asymmetry. These opposing frontoparietal CT asymmetries were broadly preserved in all five SCA groups. However, we also detected foci of shifting CT asymmetry with aneuploidy, which fell almost exclusively within regions of significant CT asymmetry in controls. Specifically, X-chromosome aneuploidy accentuated normative rightward inferior frontal asymmetries, while Y-chromosome aneuploidy reversed normative rightward medial prefrontal and lateral temporal asymmetries. These findings indicate that (1) the stereotyped normative pattern of opposing frontoparietal CT asymmetry arises from developmental mechanisms that can withstand gross chromosomal aneuploidy and (2) X and Y chromosomes can exert focal, nonoverlapping and directionally opposed influences on CT asymmetry within cortical regions of significant asymmetry in health. Our study attests to the resilience of developmental mechanisms that support the global patterning of CT asymmetry in humans, and motivates future research into the molecular bases and functional consequences of sex chromosome dosage effects on CT asymmetry.


Assuntos
Aneuploidia , Mapeamento Encefálico/métodos , Encéfalo/anormalidades , Encéfalo/fisiologia , Cromossomos Sexuais/genética , Adolescente , Adulto , Criança , Pré-Escolar , Feminino , Humanos , Estudos Longitudinais , Masculino , Adulto Jovem
10.
Neuropsychol Rev ; 26(4): 394-419, 2016 12.
Artigo em Inglês | MEDLINE | ID: mdl-27632384

RESUMO

The extent to which cognition is verbally mediated in neurotypical individuals is the subject of debate in cognitive neuropsychology, as well as philosophy and psychology. Studying "verbal thinking" in developmental/neuropsychological disorders provides a valuable opportunity to inform theory building, as well as clinical practice. In this paper, we provide a comprehensive, critical review of such studies among individuals with autism spectrum disorder (ASD). ASD involves severe social-communication deficits and limitations in cognitive/behavioural flexibility. The prevailing view in the field is that neither cognition nor behaviour is mediated verbally in ASD, and that this contributes to diagnostic features. However, our review suggests that, on the contrary, most studies to date actually find that among people with ASD cognitive task performance is either a) mediated verbally in a typical fashion, or b) not mediated verbally, but at no obvious cost to overall task performance. Overall though, these studies have methodological limitations and thus clear-cut conclusions are not possible at this stage. The aim of the review is to take stock of existing empirical findings, as well as to help develop the directions for future research that will resolve the many outstanding issues in this field.


Assuntos
Transtorno do Espectro Autista/complicações , Transtorno do Espectro Autista/psicologia , Transtornos da Comunicação/etiologia , Transtornos do Neurodesenvolvimento/etiologia , Fala/fisiologia , Pensamento/fisiologia , Humanos
11.
Proc Natl Acad Sci U S A ; 110(36): E3435-44, 2013 Sep 03.
Artigo em Inglês | MEDLINE | ID: mdl-23959883

RESUMO

The hemispheric lateralization of certain faculties in the human brain has long been held to be beneficial for functioning. However, quantitative relationships between the degree of lateralization in particular brain regions and the level of functioning have yet to be established. Here we demonstrate that two distinct forms of functional lateralization are present in the left vs. the right cerebral hemisphere, with the left hemisphere showing a preference to interact more exclusively with itself, particularly for cortical regions involved in language and fine motor coordination. In contrast, right-hemisphere cortical regions involved in visuospatial and attentional processing interact in a more integrative fashion with both hemispheres. The degree of lateralization present in these distinct systems selectively predicted behavioral measures of verbal and visuospatial ability, providing direct evidence that lateralization is associated with enhanced cognitive ability.


Assuntos
Encéfalo/fisiologia , Lateralidade Funcional/fisiologia , Idioma , Comportamento Verbal/fisiologia , Adolescente , Adulto , Atenção/fisiologia , Encéfalo/anatomia & histologia , Humanos , Imageamento por Ressonância Magnética , Masculino , Percepção Espacial/fisiologia , Percepção Visual/fisiologia , Adulto Jovem
12.
Zoo Biol ; 35(2): 128-36, 2016.
Artigo em Inglês | MEDLINE | ID: mdl-26802736

RESUMO

The activity patterns and social interactions of two species of captive sifaka were observed during a 2-year period. Allogrooming was not observed in golden-crowned sifaka and they spent significantly more time resting than the Coquerel's sifaka. Females of both species were found to be dominant to males. The golden-crowned sifaka (Propithecus tattersalli) spent significantly less time feeding than the Coquerel's sifaka. Temperature, time of day, species, and interpair comparisons for the golden-crowned sifaka were found to affect activity and social interactions, while gender did not. Like the Coquerel's sifaka, the golden-crowned sifaka was found to be diurnal; however, they differed in that the golden-crowned sifaka did not descend to the ground.


Assuntos
Animais de Zoológico/fisiologia , Comportamento Animal/fisiologia , Comportamento Alimentar/fisiologia , Strepsirhini/fisiologia , Animais , Ritmo Circadiano , Feminino , Masculino , Atividade Motora/fisiologia , Comportamento Social
13.
Brain ; 137(Pt 9): 2588-99, 2014 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-25060095

RESUMO

Individuals with autism are often characterized as 'seeing the trees, but not the forest'-attuned to individual details in the visual world at the expense of the global percept they compose. Here, we tested the extent to which global processing deficits in autism reflect impairments in (i) primary visual processing; or (ii) decision-formation, using an archetypal example of global perception, coherent motion perception. In an event-related functional MRI experiment, 43 intelligence quotient and age-matched male participants (21 with autism, age range 15-27 years) performed a series of coherent motion perception judgements in which the amount of local motion signals available to be integrated into a global percept was varied by controlling stimulus viewing duration (0.2 or 0.6 s) and the proportion of dots moving in the correct direction (coherence: 4%, 15%, 30%, 50%, or 75%). Both typical participants and those with autism evidenced the same basic pattern of accuracy in judging the direction of motion, with performance decreasing with reduced coherence and shorter viewing durations. Critically, these effects were exaggerated in autism: despite equal performance at the long duration, performance was more strongly reduced by shortening viewing duration in autism (P < 0.015) and decreasing stimulus coherence (P < 0.008). To assess the neural correlates of these effects we focused on the responses of primary visual cortex and the middle temporal area, critical in the early visual processing of motion signals, as well as a region in the intraparietal sulcus thought to be involved in perceptual decision-making. The behavioural results were mirrored in both primary visual cortex and the middle temporal area, with a greater reduction in response at short, compared with long, viewing durations in autism compared with controls (both P < 0.018). In contrast, there was no difference between the groups in the intraparietal sulcus (P > 0.574). These findings suggest that reduced global motion perception in autism is driven by an atypical response early in visual processing and may reflect a fundamental perturbation in neural circuitry.


Assuntos
Transtorno Autístico/diagnóstico , Transtorno Autístico/fisiopatologia , Percepção de Movimento/fisiologia , Estimulação Luminosa/métodos , Córtex Visual/fisiologia , Adolescente , Adulto , Transtorno Autístico/psicologia , Humanos , Masculino , Desempenho Psicomotor/fisiologia , Tempo de Reação/fisiologia , Córtex Visual/crescimento & desenvolvimento
14.
Cereb Cortex ; 24(1): 37-48, 2014 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-23019245

RESUMO

Studies of autism spectrum disorders (ASDs) reveal dysfunction in the neural systems mediating object processing (particularly faces) and social cognition, but few investigations have systematically assessed the specificity of the dysfunction. We compared cortical responses in typically developing adolescents and those with ASD to stimuli from distinct conceptual domains known to elicit category-related activity in separate neural systems. In Experiment 1, subjects made category decisions to photographs, videos, and point-light displays of people and tools. In Experiment 2, subjects interpreted displays of simple, geometric shapes in motion depicting social or mechanical interactions. In both experiments, we found a selective deficit in the ASD subjects for dynamic social stimuli (videos and point-light displays of people, moving geometric shapes), but not static images, in the functionally localized lateral region of the right fusiform gyrus, including the fusiform face area. In contrast, no group differences were found in response to either static images or dynamic stimuli in other brain regions associated with face and social processing (e.g. posterior superior temporal sulcus, amygdala), suggesting disordered connectivity between these regions and the fusiform gyrus in ASD. This possibility was confirmed by functional connectivity analysis.


Assuntos
Transtornos Globais do Desenvolvimento Infantil/psicologia , Neuroimagem/métodos , Percepção Social , Lobo Temporal/fisiopatologia , Adolescente , Análise de Variância , Criança , Transtornos Globais do Desenvolvimento Infantil/fisiopatologia , Interpretação Estatística de Dados , Face , Feminino , Percepção de Forma/fisiologia , Humanos , Processamento de Imagem Assistida por Computador , Imageamento por Ressonância Magnética , Masculino , Percepção de Movimento/fisiologia , Estimulação Luminosa , Desempenho Psicomotor/fisiologia , Adulto Jovem
15.
Hum Brain Mapp ; 35(5): 1885-95, 2014 May.
Artigo em Inglês | MEDLINE | ID: mdl-23728856

RESUMO

Patient lesion and functional magnetic resonance imaging (fMRI) studies have provided convincing evidence that a distributed brain network subserves word knowledge. However, little is known about the structural correlates of this network within the context of typical development and whether anatomical coupling in linguistically relevant regions of cortex varies as a function of vocabulary skill. Here we investigate the association between vocabulary and anatomical coupling in 235 typically developing youth (ages 6-19 years) using structural MRI. The study's primary aim was to evaluate whether higher vocabulary performance was associated with greater vertex-level cortical thickness covariation in distributed regions of cortex known to be associated with word knowledge. Results indicate that better vocabulary skills are associated with greater anatomical coupling in several linguistically relevant regions of cortex, including the left inferior parietal (temporal-parietal junction), inferior temporal, middle frontal, and superior frontal gyri and the right inferior frontal and precentral gyri. Furthermore, in high vocabulary scorers, stronger coupling is found among these regions. Thus, complementing patient and fMRI studies, this is the first investigation to highlight the relevance of anatomical covariance within the cortex to vocabulary skills in typically developing youth, further elucidating the distributed nature of neural systems subserving word knowledge.


Assuntos
Córtex Cerebral/anatomia & histologia , Córtex Cerebral/fisiologia , Individualidade , Comportamento Verbal , Vocabulário , Adolescente , Fatores Etários , Criança , Desenvolvimento Infantil , Estudos Transversais , Feminino , Lateralidade Funcional , Humanos , Processamento de Imagem Assistida por Computador , Testes de Inteligência , Imageamento por Ressonância Magnética , Masculino , Adulto Jovem
16.
J Child Psychol Psychiatry ; 55(4): 374-83, 2014 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-24256459

RESUMO

BACKGROUND: Unstuck and On Target (UOT) is an executive function (EF) intervention for children with autism spectrum disorders (ASD) targeting insistence on sameness, flexibility, goal-setting, and planning through a cognitive-behavioral program of self-regulatory scripts, guided/faded practice, and visual/verbal cueing. UOT is contextually-based because it is implemented in school and at home, the contexts in which a child uses EF skills. METHODS: To evaluate the effectiveness of UOT compared with a social skills intervention (SS), 3rd-5th graders with ASD (mean IQ = 108; UOT n = 47; SS n = 20) received interventions delivered by school staff in small group sessions. Students were matched for gender, age, race, IQ, ASD symptomotolgy, medication status, and parents' education. Interventions were matched for 'dose' of intervention and training. Measures of pre-post change included classroom observations, parent/teacher report, and direct child measures of problem-solving, EF, and social skills. Schools were randomized and evaluators, but not parents or teachers, were blinded to intervention type. RESULTS: Interventions were administered with high fidelity. Children in both groups improved with intervention, but mean change scores from pre- to postintervention indicated significantly greater improvements for UOT than SS groups in: problem-solving, flexibility, and planning/organizing. Also, classroom observations revealed that participants in UOT made greater improvements than SS participants in their ability to follow rules, make transitions, and be flexible. Children in both groups made equivalent improvements in social skills. CONCLUSIONS: These data support the effectiveness of the first contextually-based EF intervention for children with ASD. UOT improved classroom behavior, flexibility, and problem-solving in children with ASD. Individuals with variable background/training in ASD successfully implemented UOT in mainstream educational settings.


Assuntos
Transtornos Globais do Desenvolvimento Infantil/terapia , Terapia Cognitivo-Comportamental/métodos , Função Executiva , Criança , Transtornos Globais do Desenvolvimento Infantil/psicologia , Feminino , Humanos , Masculino , Testes Neuropsicológicos , Resolução de Problemas , Instituições Acadêmicas , Habilidades Sociais , Resultado do Tratamento , Escalas de Wechsler
17.
Brain ; 136(Pt 6): 1956-67, 2013 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-23715094

RESUMO

Autism spectrum disorders are associated with atypically excessive early brain growth. Recent studies suggest that later cortical development, specifically cortical thickness, during adolescence and young adulthood is also aberrant. Nevertheless, previous studies of other surface-based metrics (e.g. surface area and gyrification) at high-resolution in autism spectrum disorders are limited. Forty-one males with autism spectrum disorders and 39 typically developing males matched on age (mean ≈ 17; range = 12-24 years) and IQ (mean ≈ 113; range = 85-143) provided high-resolution 3 T anatomical magnetic resonance imaging scans. The FreeSurfer image analysis suite quantified vertex-level surface area and gyrification. There were gyrification increases in the autism spectrum disorders group (relative to typically developing subjects) localized to bilateral posterior cortices (cluster corrected P < 0.01). Furthermore, the association between vocabulary knowledge and gyrification in left inferior parietal cortex (typically developing group: positive correlation; autism spectrum disorders group: no association) differed between groups. Finally, there were no group differences in surface area, and there was no interaction between age and group for either surface area or gyrification (both groups showed decreasing gyrification with increasing age). The present study complements and extends previous work by providing the first evidence of increased gyrification (though no differences in surface area) at high resolution among adolescents and young adults with autism spectrum disorders and by showing a dissociation in the relationship between vocabulary and gyrification in autism spectrum disorders versus typically developing subjects. In contrast with previous findings of age-related cortical thinning in this same autism spectrum disorders sample, here we find that increases in gyrification are maintained across adolescence and young adulthood, implicating developmentally dissociable cortical atypicalities in autism spectrum disorders.


Assuntos
Mapeamento Encefálico/métodos , Córtex Cerebral/patologia , Transtornos Globais do Desenvolvimento Infantil/patologia , Adolescente , Córtex Cerebral/fisiologia , Criança , Transtornos Globais do Desenvolvimento Infantil/psicologia , Giro do Cíngulo/patologia , Giro do Cíngulo/fisiologia , Humanos , Masculino , Tamanho do Órgão , Adulto Jovem
18.
Arch Sex Behav ; 43(8): 1525-33, 2014 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-24619651

RESUMO

Evidence suggests over-representation of autism spectrum disorders (ASDs) and behavioral difficulties among people referred for gender issues, but rates of the wish to be the other gender (gender variance) among different neurodevelopmental disorders are unknown. This chart review study explored rates of gender variance as reported by parents on the Child Behavior Checklist (CBCL) in children with different neurodevelopmental disorders: ASD (N = 147, 24 females and 123 males), attention deficit hyperactivity disorder (ADHD; N = 126, 38 females and 88 males), or a medical neurodevelopmental disorder (N = 116, 57 females and 59 males), were compared with two non-referred groups [control sample (N = 165, 61 females and 104 males) and non-referred participants in the CBCL standardization sample (N = 1,605, 754 females and 851 males)]. Significantly greater proportions of participants with ASD (5.4%) or ADHD (4.8%) had parent reported gender variance than in the combined medical group (1.7%) or non-referred comparison groups (0-0.7%). As compared to non-referred comparisons, participants with ASD were 7.59 times more likely to express gender variance; participants with ADHD were 6.64 times more likely to express gender variance. The medical neurodevelopmental disorder group did not differ from non-referred samples in likelihood to express gender variance. Gender variance was related to elevated emotional symptoms in ADHD, but not in ASD. After accounting for sex ratio differences between the neurodevelopmental disorder and non-referred comparison groups, gender variance occurred equally in females and males.


Assuntos
Transtorno do Deficit de Atenção com Hiperatividade/psicologia , Transtornos Globais do Desenvolvimento Infantil/psicologia , Identidade de Gênero , Transexualidade/complicações , Adolescente , Transtorno do Deficit de Atenção com Hiperatividade/diagnóstico , Transtorno do Deficit de Atenção com Hiperatividade/epidemiologia , Criança , Transtornos Globais do Desenvolvimento Infantil/diagnóstico , Transtornos Globais do Desenvolvimento Infantil/epidemiologia , Cognição , Comorbidade , Feminino , Humanos , Masculino , Pais , Escalas de Graduação Psiquiátrica , Fatores Sexuais , Transexualidade/psicologia , Estados Unidos/epidemiologia
19.
Autism Adulthood ; 6(3): 345-361, 2024 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-39371362

RESUMO

Background: Camouflaging involves the masking of autism traits, potentially creating an outer impression of "non-autisticness." Although associations of camouflaging with anxiety and depression in autistic adults are widely reported, factors that mediate these associations are unclear. We examined two potential mediators of the association between camouflaging and anxiety/depression: perceived stress and emotion regulation (ER) challenges. Methods: Seven hundred eighty-seven autistic adults (18.2-78.2 years) recruited through Simons Powering Autism Research (SPARK) Research Match completed questionnaires, including the Camouflaging Autistic Traits Questionnaire (CAT-Q), and measures of autistic traits, depressive and anxious symptomatology, perceived stress, and ER challenges. Four moderated mediation models were tested. In all models the independent variable was CAT-Q total score, and the moderator variable was sex designated at birth. The dependent variable was depressive or anxious symptomatology, and the mediator variable was perceived stress or ER challenges. Results: We found that more camouflaging, increased ER challenges, and higher levels of perceived stress were associated with greater depressive and anxious symptomatology. We also found that perceived stress and ER challenges significantly mediated the associations between camouflaging and both depression and anxiety. In the model with perceived stress and anxiety, sex moderated the mediation, with females showing a stronger mediation. There was no significant moderation in any of the other models. Conclusion: We contextualize the findings within the broader literature on camouflaging as a response to stigma and other facets of minority stress. We discuss how the results of this study support the idea that the day-to-day stress of living in a neurotypical world, the cognitively demanding nature of camouflaging, and the constraints that camouflaging place on autistic people's behaviors in social contexts (e.g., contributing to suppressing ER strategies such as stimming), create a cycle that contributes to elevated rates of anxiety and depression in autistic people.


Why is this an important issue? Camouflaging describes behaviors that can mask social differences. Camouflaging includes things such as "copying" other people's hand movements or facial expressions. Some autistic people say camouflaging feels like they are "pretending" to be someone they are not. Camouflaging is associated with depression and anxiety. We do not know exactly what other factors may be related to these associations between camouflaging and depression and anxiety. Autistic adults have high rates of depression and anxiety. It is important to understand factors that might make autistic adults more vulnerable to depression and anxiety. What was the purpose of this study? The purpose of this study was to look at possible factors related to associations between camouflaging and anxiety and depression. We looked at two factors: perceived stress and emotion regulation challenges. Perceived stress is how stressed a person feels in their day-to-day life. Emotion regulation is how a person handles their emotions across different situations. We looked at perceived stress and emotion regulation challenges for three main reasons. First, autistic adults report high levels of perceived stress and challenges with emotion regulation. Second, perceived stress and emotion regulation challenges are both associated with depression and anxiety in autistic people. Third, camouflaging is associated with increased stress in autistic people. What did the researchers do? We asked 787 autistic adults living in the United States to complete surveys. Participants answered questions about camouflaging. Participants rated their anxiety and depression. Participants reported on how stressed they felt and how they handled their emotions. We looked at associations between camouflaging and depression and anxiety. We also looked at whether different amounts of perceived stress or different challenges handling emotions were associated with camouflaging, depression, and anxiety. We tested whether all of these associations differed for autistic people designated male sex at birth relative to those designated female sex at birth. What were the results of the study? We found that more camouflaging, increased emotion regulation challenges, and higher levels of perceived stress were all associated with more depression and anxiety. We also found that perceived stress and emotion regulation challenges each significantly related to the associations between camouflaging and both depression and anxiety. For the most part, these associations did not differ for autistic people who were designated male sex at birth relative to those who were designated female sex at birth. What do these findings add to what is already known? These findings support the idea that the day-to-day stress of living in a neurotypical world play a part in elevated rates of anxiety and depression in autistic people. What are the potential weaknesses in the study? We collected information from autistic people at one point in time. This limits how we can interpret the associations we found. How will these findings help autistic adults now or in the future? These findings may help us to better understand why autistic adults are at risk for depression and anxiety. The findings may show us ways to improve the mental health of autistic adults.

20.
Autism ; : 13623613241255774, 2024 Jun 12.
Artigo em Inglês | MEDLINE | ID: mdl-38864310

RESUMO

LAY ABSTRACT: Finding a job can be hard for autistic adults. No studies have been completed that look into whether having difficulties learning and troubles finding a job are related in this population. The current study did so by evaluating the Learning Needs Screening Tool, a measure of learning challenges used in vocational rehabilitation settings, or places meant to help people find work. A total of 401 autistic adults completed this study online. Specifically, the study evaluated (a) the characteristics of the Learning Needs Screening Tool, including the relationships between questions that ask about similar learning challenges, and (b) the ability of the measure to relate to real-world outcomes that are associated with learning difficulties, namely prior special education receipt and difficulties finding a job. Evaluation of the questions asked on the Learning Needs Screening Tool revealed that they were highly related and that learning difficulties fell into different categories. Fifty-six percent of the people in the study showed learning challenges on the measure. People who were identified as having learning difficulties on the Learning Needs Screening Tool had higher rates of receiving special education services in the past and lower rates of current employment. These results suggest that the Learning Needs Screening Tool may help to identify autistic job seekers who have learning difficulties and may have more challenges finding a job.

SELEÇÃO DE REFERÊNCIAS
Detalhe da pesquisa