Multivariate word properties in fluency tasks reveal markers of Alzheimer's dementia.

INTRODUCTION: Verbal fluency tasks are common in Alzheimer's disease (AD) assessments. Yet, standard valid response counts fail to reveal disease-specific semantic memory patterns. Here, we leveraged automated word-property analysis to capture neurocognitive markers of AD vis-à-vis behavioral variant frontotemporal dementia (bvFTD). METHODS: Patients and healthy controls completed two fluency tasks. We counted valid responses and computed each word's frequency, granularity, neighborhood, length, familiarity, and imageability. These features were used for group-level discrimination, patient-level identification, and correlations with executive and neural (magnetic resonanance imaging [MRI], functional MRI [fMRI], electroencephalography [EEG]) patterns. RESULTS: Valid responses revealed deficits in both disorders. Conversely, frequency, granularity, and neighborhood yielded robust group- and subject-level discrimination only in AD, also predicting executive outcomes. Disease-specific cortical thickness patterns were predicted by frequency in both disorders. Default-mode and salience network hypoconnectivity, and EEG beta hypoconnectivity, were predicted by frequency and granularity only in AD. DISCUSSION: Word-property analysis of fluency can boost AD characterization and diagnosis. HIGHLIGHTS: We report novel word-property analyses of verbal fluency in AD and bvFTD. Standard valid response counts captured deficits and brain patterns in both groups. Specific word properties (e.g., frequency, granularity) were altered only in AD. Such properties predicted cognitive and neural (MRI, fMRI, EEG) patterns in AD. Word-property analysis of fluency can boost AD characterization and diagnosis.

Multimodal mechanisms of human socially reinforced learning across neurodegenerative diseases.

Social feedback can selectively enhance learning in diverse domains. Relevant neurocognitive mechanisms have been studied mainly in healthy persons, yielding correlational findings. Neurodegenerative lesion models, coupled with multimodal brain measures, can complement standard approaches by revealing direct multidimensional correlates of the phenomenon. To this end, we assessed socially reinforced and non-socially reinforced learning in 40 healthy participants as well as persons with behavioural variant frontotemporal dementia (n = 21), Parkinson's disease (n = 31) and Alzheimer's disease (n = 20). These conditions are typified by predominant deficits in social cognition, feedback-based learning and associative learning, respectively, although all three domains may be partly compromised in the other conditions. We combined a validated behavioural task with ongoing EEG signatures of implicit learning (medial frontal negativity) and offline MRI measures (voxel-based morphometry). In healthy participants, learning was facilitated by social feedback relative to non-social feedback. In comparison with controls, this effect was specifically impaired in behavioural variant frontotemporal dementia and Parkinson's disease, while unspecific learning deficits (across social and non-social conditions) were observed in Alzheimer's disease. EEG results showed increased medial frontal negativity in healthy controls during social feedback and learning. Such a modulation was selectively disrupted in behavioural variant frontotemporal dementia. Neuroanatomical results revealed extended temporo-parietal and fronto-limbic correlates of socially reinforced learning, with specific temporo-parietal associations in behavioural variant frontotemporal dementia and predominantly fronto-limbic regions in Alzheimer's disease. In contrast, non-socially reinforced learning was consistently linked to medial temporal/hippocampal regions. No associations with cortical volume were found in Parkinson's disease. Results are consistent with core social deficits in behavioural variant frontotemporal dementia, subtle disruptions in ongoing feedback-mechanisms and social processes in Parkinson's disease and generalized learning alterations in Alzheimer's disease. This multimodal approach highlights the impact of different neurodegenerative profiles on learning and social feedback. Our findings inform a promising theoretical and clinical agenda in the fields of social learning, socially reinforced learning and neurodegeneration.

Multimodal Neurocognitive Markers of Naturalistic Discourse Typify Diverse Neurodegenerative Diseases.

Neurodegeneration has multiscalar impacts, including behavioral, neuroanatomical, and neurofunctional disruptions. Can disease-differential alterations be captured across such dimensions using naturalistic stimuli? To address this question, we assessed comprehension of four naturalistic stories, highlighting action, nonaction, social, and nonsocial events, in Parkinson's disease (PD) and behavioral variant frontotemporal dementia (bvFTD) relative to Alzheimer's disease patients and healthy controls. Text-specific correlates were evaluated via voxel-based morphometry, spatial (fMRI), and temporal (hd-EEG) functional connectivity. PD patients presented action-text deficits related to the volume of action-observation regions, connectivity across motor-related and multimodal-semantic hubs, and frontal hd-EEG hypoconnectivity. BvFTD patients exhibited social-text deficits, associated with atrophy and spatial connectivity patterns along social-network hubs, alongside right frontotemporal hd-EEG hypoconnectivity. Alzheimer's disease patients showed impairments in all stories, widespread atrophy and spatial connectivity patterns, and heightened occipitotemporal hd-EEG connectivity. Our framework revealed disease-specific signatures across behavioral, neuroanatomical, and neurofunctional dimensions, highlighting the sensitivity and specificity of a single naturalistic task. This investigation opens a translational agenda combining ecological approaches and multimodal cognitive neuroscience for the study of neurodegeneration.

Interoception Primes Emotional Processing: Multimodal Evidence from Neurodegeneration.

Recent frameworks in cognitive neuroscience and behavioral neurology underscore interoceptive priors as core modulators of negative emotions. However, the field lacks experimental designs manipulating the priming of emotions via interoception and exploring their multimodal signatures in neurodegenerative models. Here, we designed a novel task that involves interoceptive and control-exteroceptive priming conditions followed by post-interoception and post-exteroception facial emotion recognition (FER). We recruited 114 participants, including healthy controls (HCs) as well as patients with behavioral variant frontotemporal dementia (bvFTD), Parkinson's disease (PD), and Alzheimer's disease (AD). We measured online EEG modulations of the heart-evoked potential (HEP), and associations with both brain structural and resting-state functional connectivity patterns. Behaviorally, post-interoception negative FER was enhanced in HCs but selectively disrupted in bvFTD and PD, with AD presenting generalized disruptions across emotion types. Only bvFTD presented impaired interoceptive accuracy. Increased HEP modulations during post-interoception negative FER was observed in HCs and AD, but not in bvFTD or PD patients. Across all groups, post-interoception negative FER correlated with the volume of the insula and the ACC. Also, negative FER was associated with functional connectivity along the (a) salience network in the post-interoception condition, and along the (b) executive network in the post-exteroception condition. These patterns were selectively disrupted in bvFTD (a) and PD (b), respectively. Our approach underscores the multidimensional impact of interoception on emotion, while revealing a specific pathophysiological marker of bvFTD. These findings inform a promising theoretical and clinical agenda in the fields of nteroception, emotion, allostasis, and neurodegeneration.SIGNIFICANCE STATEMENT We examined whether and how emotions are primed by interoceptive states combining multimodal measures in healthy controls and neurodegenerative models. In controls, negative emotion recognition and ongoing HEP modulations were increased after interoception. These patterns were selectively disrupted in patients with atrophy across key interoceptive-emotional regions (e.g., the insula and the cingulate in frontotemporal dementia, frontostriatal networks in Parkinson's disease), whereas persons with Alzheimer's disease presented generalized emotional processing abnormalities with preserved interoceptive mechanisms. The integration of both domains was associated with the volume and connectivity (salience network) of canonical interoceptive-emotional hubs, critically involving the insula and the anterior cingulate. Our study reveals multimodal markers of interoceptive-emotional priming, laying the groundwork for new agendas in cognitive neuroscience and behavioral neurology.

At the Heart of Neurological Dimensionality: Cross-Nosological and Multimodal Cardiac Interoceptive Deficits.

OBJECTIVE: Neurological nosology, based on categorical systems, has largely ignored dimensional aspects of neurocognitive impairments. Transdiagnostic dimensional approaches of interoception (the sensing of visceral signals) may improve the descriptions of cross-pathological symptoms at behavioral, electrophysiological, and anatomical levels. Alterations of cardiac interoception (encompassing multidimensional variables such as accuracy, learning, sensibility, and awareness) and its neural correlates (electrophysiological markers, imaging-based anatomical and functional connectivity) have been proposed as critical across disparate neurological disorders. However, no study has examined the specific impact of neural (relative to autonomic) disturbances of cardiac interoception or their differential manifestations across neurological conditions. METHODS: Here, we used a computational approach to classify and evaluate which markers of cardiac interoception (behavioral, metacognitive, electrophysiological, volumetric, or functional) offer the best discrimination between neurological conditions and cardiac (hypertensive) disease (model 1), and among neurological conditions (Alzheimer's disease, frontotemporal dementia, multiple sclerosis, and brain stroke; model 2). In total, the study comprised 52 neurological patients (mean [standard deviation] age = 55.1 [17.3] years; 37 women), 25 cardiac patients (age = 66.2 [9.1] years; 13 women), and 72 healthy controls (age = 52.65 [17.1] years; 50 women). RESULTS: Cardiac interoceptive outcomes successfully classified between neurological and cardiac conditions (model 1: >80% accuracy) but not among neurological conditions (model 2: 53% accuracy). Behavioral cardiac interoceptive alterations, although present in all conditions, were powerful in differentiating between neurological and cardiac diseases. However, among neurological conditions, cardiac interoceptive deficits presented more undifferentiated and unspecific disturbances across dimensions. CONCLUSIONS: Our result suggests a diffuse pattern of interoceptive alterations across neurological conditions, highlighting their potential role as dimensional, transdiagnostic markers.

Your perspective and my benefit: multiple lesion models of self-other integration strategies during social bargaining.

Recursive social decision-making requires the use of flexible, context-sensitive long-term strategies for negotiation. To succeed in social bargaining, participants' own perspectives must be dynamically integrated with those of interactors to maximize self-benefits and adapt to the other's preferences, respectively. This is a prerequisite to develop a successful long-term self-other integration strategy. While such form of strategic interaction is critical to social decision-making, little is known about its neurocognitive correlates. To bridge this gap, we analysed social bargaining behaviour in relation to its structural neural correlates, ongoing brain dynamics (oscillations and related source space), and functional connectivity signatures in healthy subjects and patients offering contrastive lesion models of neurodegeneration and focal stroke: behavioural variant frontotemporal dementia, Alzheimer's disease, and frontal lesions. All groups showed preserved basic bargaining indexes. However, impaired self-other integration strategy was found in patients with behavioural variant frontotemporal dementia and frontal lesions, suggesting that social bargaining critically depends on the integrity of prefrontal regions. Also, associations between behavioural performance and data from voxel-based morphometry and voxel-based lesion-symptom mapping revealed a critical role of prefrontal regions in value integration and strategic decisions for self-other integration strategy. Furthermore, as shown by measures of brain dynamics and related sources during the task, the self-other integration strategy was predicted by brain anticipatory activity (alpha/beta oscillations with sources in frontotemporal regions) associated with expectations about others' decisions. This pattern was reduced in all clinical groups, with greater impairments in behavioural variant frontotemporal dementia and frontal lesions than Alzheimer's disease. Finally, connectivity analysis from functional magnetic resonance imaging evidenced a fronto-temporo-parietal network involved in successful self-other integration strategy, with selective compromise of long-distance connections in frontal disorders. In sum, this work provides unprecedented evidence of convergent behavioural and neurocognitive signatures of strategic social bargaining in different lesion models. Our findings offer new insights into the critical roles of prefrontal hubs and associated temporo-parietal networks for strategic social negotiation.

Stroke and Neurodegeneration Induce Different Connectivity Aberrations in the Insula.

BACKGROUND AND PURPOSE: Stroke and neurodegeneration cause significant brain damage and cognitive impairment, especially if the insular cortex is compromised. This study explores for the first time whether these 2 causes differentially alter connectivity patterns in the insular cortex. METHODS: Resting state-functional magnetic resonance imaging data were collected from patients with insular stroke, patients with behavioral variant frontotemporal dementia, and healthy controls. Data from the 3 groups were assessed through a correlation function analysis. Specifically, we compared decreases in connectivity as a function of voxel Euclidean distance within the insular cortex. RESULTS: Relative to controls, patients with stroke showed faster connectivity decays as a function of distance (hypoconnectivity). In contrast, the behavioral variant frontotemporal dementia group exhibited significant hyperconnectivity between neighboring voxels. Both patient groups evinced global hypoconnectivity. No between-group differences were observed in a volumetrically and functionally comparable region without ischemia or neurodegeneration. CONCLUSIONS: Functional insular cortex connectivity is affected differently by cerebral ischemia and neurodegeneration, possibly because of differences in the cause-specific pathophysiological mechanisms of each disease. These findings have important clinical and theoretical implications.

[A survey on biomarkers and early diagnosis in Alzheimer's disease]. / Una encuesta sobre biomarcadores y diagnóstico precoz de la enfermedad de Alzheimer.

Given the potential use of biomarkers in the diagnosis of Alzheimer's disease (AD) in early stages, new ethical and communication dilemmas appear in everyday clinical practice. The aim of this study was to know the opinion of health professionals (HP) and general public (GP) on the implementation of early diagnostic techniques in AD and the use of biomarkers for this purpose. A survey with multiple choice answers was elaborated in two versions: one for HP and the other for GP. Respondents were invited to participate through a system of mass mailing e-mail; e-mail addresses were collected from CEMIC database. A total of 1503 answers were analyzed: 807 HP and 696 GP. Most respondents, 84.7%, preferred the option of early diagnosis of AD even knowing the lack of curative treatment. Forty five percent of GP and 26.8% of HP replied that there is no ethical dilemma in the use of biomarkers and that no communication or ethical dilemma is generated to physicians when informing the diagnosis of the disease. The HP group showed more divergence in the views than the GP group. These results may indicate a change in the physician-patient relationship, showing the GP group with an active and supportive position towards the use of biomarkers for early diagnosis of AD.

[Ethical considerations regarding the communication of diagnosis of prodromal Alzheimer's disease]. / Consideraciones éticas de la comunicación diagnóstica en la enfermedad de Alzheimer prodrómica.

Population aging has increased age-related diseases such as dementia, Alzheimer's disease (AD) being the most common in older adults (50%-60%). It is one of the most feared conditions for its irreversible and incurable, by its chronicity and it consists of a long process of depersonalization. The clinical diagnosis is mainly based on DSM-IV and NINCDS-ADRDA. Definitive diagnosis is post-mortem, as it requires histopathological confirmation. However, there have been new diagnostic criteria based EA biomarkers, which can be done in life, anticipating the course of several years before dementia. Thus, physicians are increasingly exposed to AD patients in early stages, having to face the dilemma of communicating the diagnosis to a patient with cognitive failures and disease awareness, with the implications that generates about him and his family. The objectives of this paper will analyze the ethical problem of communication of clinical diagnosis of AD in prodromal stages (pre-dementia) in our country, based on the analysis of ethical principles (autonomy and non maleficence) involved in decision making.

Occupational complexity of paid work and housework, and its impact on the cognitive performance in community dwelling older adults, preliminary results.

Work and activity could be an important source of cognitive enrichment. Activities that are more challenging concerning the cognitive functions that are put into practice are associated with lower risk of cognitive decline in old age. Objective: The present study aimed to assess the impact of occupational complexity and household tasks in three cognitive domains (verbal episodic memory, language, and executive functions) in older adults residing within the community. Methods: A trail analysis was executed, using the structural equations procedure in 120 participants assessed with main lifetime occupational activity and household tasks questionnaire, as well as a neuropsychological assessment battery for memory, language, and executive functions. Results: The regression weights analysis indicated that complexity in household chores showed moderate effects on executive functions (ß=0.19; p=0.027) and that occupational complexity of paid work showed effects on memory (ß=0.26; p=0.008), language (ß=0.38; p<0.001), and executive functions (ß=0.55; p<0.001). Conclusion: Paid work promotes cognitive reserve, contrary to household activities which seem to have a moderate impact on cognition. Differences in activity complexity not only impact people´s economic and social status and possibilities but can also determine different courses of aging and cognitive risk.

Trabalho e atividade podem ser importantes fontes de enriquecimento cognitivo. Atividades que são mais desafiadoras quanto às funções cognitivas postas em prática se associam a menor risco de declínio cognitivo em idade avançada. Objetivo: O objetivo do presente estudo é avaliar o impacto da complexidade ocupacional e das tarefas domésticas em três domínio cognitivos (memória episódica verbal, linguagem e funções executivas) em idosos residentes na comunidade. Métodos: Foi realizada uma análise de trilha com o uso de procedimento de equações estruturais em 120 participantes, avaliados por meio de: questionário das principais atividades ocupacionais e tarefas domésticas da vida, bem como bateria de avaliação neuropsicológica para memória, linguagem e funções executivas. Resultados: A análise dos pesos de regressou mostrou que a complexidade nas tarefas domésticas apresenta efeitos moderados nas funções executivas (ß=0,19; p=0,027) e que a complexidade ocupacional do trabalho remunerado teve efeitos sobre a memória (ß=0,26; p=0,008), linguagem (ß=0,38; p<0,001) e funções executivas (ß=0,55; p<0,001). Conclusão: O trabalho remunerado promove a reserva cognitiva, em contraste com as atividades domésticas, que parecem ter impacto moderado na cognição. As diferenças na complexidade das atividades não apenas impactam o status econômico e social e as possibilidades das pessoas, mas também podem determinar diferentes cursos de envelhecimento e risco cognitivo.

Efficacy of a cognitive intervention program in patients with mild cognitive impairment.

BACKGROUND: Mild cognitive impairment (MCI) is a transitional state between normal aging and dementia. Identifying this condition would allow early interventions that may reduce the rate of progression to Alzheimer's disease (AD). We examined the efficacy of a six-month cognitive intervention program (CIP) in patients with MCI and to assess patients' condition at one-year follow-up. METHODS: Forty-six MCI participants assessed with neuropsychological, neurological, neuropsychiatry, and functional procedures were included in this study and followed up during a year. The sample was randomized into two subgroups: 24 participants (the "trained group") underwent the CIP during six months while 22 (control group) received no treatment. Sixteen participants dropped out of the study. The intervention focused on teaching cognitive strategies, cognitive training, and use of external aids, in sessions of two hours, twice per week for six months. Cognitive and functional measures were used as primary outcome and all were followed up at one year. RESULTS: The intervention effect (mean change from baseline) was significant (p < 0.05) on the Mini-Mental State Examination (1.74), the Clinical Dementia Rating Scale (0.14), the Boston Naming Test (2.92), block design (-13.66), matrix reasoning (-3.07), and semantic fluency (-3.071) tasks. Four patients (one trained and three controls) progressed to dementia after one year of follow-up. CONCLUSIONS: These results suggest that persons with MCI can improve their performance on cognitive and functional measures when provided with early cognitive training and it could persist in a long-term follow-up.

Mild cognitive impairment: risk of dementia according to subtypes.

UNLABELLED: Mild cognitive impairment (MCI) has 3 clinical subtypes: amnestic (aMCI), multiple domains (mdMCI) and non-amnestic single domain (na-SD-MCI) whose evolutive possibility to dementia has not been profoundly studied. OBJECTIVE: This paper aims to determine the conversion to dementia of the different subtypes of MCI and determine risk factors associated to conversion to dementia. METHODS: A total of 127 patients diagnosed with MCI (age=70.21; SD=13.17) were evaluated with a neuropsychological and neuropsychiatric battery. They were classified into 3 groups: amnestic MCI (n=20), multiple-domain MCI (n=98), non-amnestic MCI (n=9). Seventeen normal subjects (age=74.59; SD=10.63) were included. RESULTS: Of those included, 27.1% developed Alzheimer's type dementia [average time for conversion to Alzheimer's dementia (AD) 11.12 months (SD=0.183)]. None of the controls developed dementia. Thirty-five percent (n=7) of amnestic MCI converted to AD: 20% (n=4) at 6 months and 15% (n=3) at 12 months); 11.1% (n=1) of the non-amnestic single domain MCI converted to AD at 6 months. It was found that 31.6% (n=31) of multiple domain MCI rotated to AD: 15.3% (n=15) at 6 months and 16.3% (n=16) at 12 months. Age (p<0.05, ß=1.03) increased the likelihood of rotation to AD. Multi-domain MCI subtype was the most frequent. However, the conversion to dementia in amnestic subtype was the highest, age and retirement being the variables that increased the likelihood of conversion to Dementia.

Assessment of an electronic system for research ethics committees document management: An observational study.

Since 1 January 2020, the Central Research Ethics Committee of the Health Ministry implemented PRIISA.BA, an in-house developed electronic system for online submission of health research applications to the 63 public and private research ethics committees (RECs) of Buenos Aires City, Argentina. This study though to compare the times to first review and the time to approval among applications submitted prior to PRIISA.BA and thereafter, across public RECs. All public RECs of the city were invited to participate. Overall, 453 applications from 10 RECs (242 pre- and 211 post-PRIISA.BA) were available for the analyses. There was a decrease in the time to first review and an increase in the time to approval after PRIISA.BA implementation. The increase in time to approval was transient and limited to the first three months. The results were consistent with analyses limited to non-COVID applications. Our results show an increase in the times to approval after the implementation of an electronic system for online submission of health research applications that, although transient, was significant. These data could be relevant to other RECs implementing this technology since it emphasizes the need of monitoring potential unnecessary delays in reviews during the critical initial period.

Variability in Ethics Review for Multicenter Protocols in Buenos Aires, Argentina. An Observational Study.

It has been reported that significant variability in the ethics review process affects multisite studies. We analyzed 1,305 applications for multicenter studies (409 unique protocols), from 1st January 2020 to 20th September 2021. We examined the variability in the times to approval and the first observation and the variation in the level of risk assigned. The median [IQR] variabilities were 42.19 [15.23-82.36] days and 8.00 [3.12-16.68] days, for the times to approval and to the first observation, respectively. There was disagreement in the level of risk assigned by the Research Ethics Committee (REC) in 24.0% of cases. Independent predictors of variability included the number of REC members. In our study, we found substantial variability in the ethics review process among health research protocols. Also, we describe methods to readily measure the delays and the variations in the ethics review process.

[Time of ethics review of research proposals: results of an observational study]. / Tiempos de evaluación ética de protocolos de investigación: resultados de un estudio observacional.

The review of research protocols by Research Ethics Committees (RECs), essential to ensure the protection of participants, has been managed in the City of Buenos Aires through the PRIISA.BA electronic platform since January 2020. The aim of the present study was to describe ethical review times, their temporal evolution, and predictors of their duration. We conducted an observational study that included all the protocols reviewed between January 2020 and September 2021. Times to approval and to first observation were calculated. Temporal trends in times, and the multivariate association between these and protocol and IRB characteristics were evaluated. 2,781 protocols reviewed in 62 RECs were included. The median time to approval was 29.11 (RIQ 11.29 to 63.35) days, and time to first observation was 8.92 (RIQ 2.05 to 18.18) days. The times were significantly reduced throughout the study period. We detected as variables independently associated with shorter time to approval to be a COVID proposal, having funding and the number of centers to perform the study and having been reviewed by an RECs with more than 10 members. Making observations to the protocol was associated with more time. The results of the present work suggest that ethical review times were reduced during study period. In addition, variables associated with time were identified that could be the object of interventions to improve the process.

Associations Among Loneliness, Purpose in Life and Subjective Cognitive Decline in Ethnoracially Diverse Older Adults Living in the United States.

Subjective cognitive decline (SCD), which precedes Mild Cognitive Impairment and dementia, may be affected by purpose in life (PiL) and loneliness in older adults. We investigated associations among PiL, loneliness, and SCD in US Latino (n = 126), Black (n = 74), Asian (n = 33), and White (n = 637) adults. Higher PiL predicted lower SCD in all groups (p-values < .012), except Black participants. Lower loneliness predicted lower SCD in Latino and White groups (p-values < .05), and PiL moderated this association in White adults. PiL and loneliness may play important roles in cognitive decline. Differential predictors of SCD suggest differential targets for preventing cognitive decline and dementia across ethnoracial groups.

[Review of recommendations and new diagnosis criteria for mild cognitive impairment due to Alzheimer's disease]. / Revisión de los nuevos criterios y recomendaciones para el diagnóstico de Deterioro Cognitivo Leve debido a Enfermedad de Alzheimer.

The symptomatic predementia phase of Alzheimer's disease (AD), known as mild cognitive impairment (MCI) is a clinical and neuropsychological condition which defines the transitional state between normal aging and dementia, and is used as a clinical description of people at risk of developing AD. A review of the diagnostic criteria of MCI due to Alzheimer's disease was recently published by the Alzheimer's Association and the National Institute on Aging of the U.S. in order to ensure early diagnosis of the disease, useful for both clinical practice and clinical trials. The objectives of this paper are to review and analyze the revised diagnostic criteria for MCI due to Alzheimer's disease recently proposed, to compare with criteria for MCI available and to establish current strengths and limitations of the new proposal in clinical practice. The new diagnostic criteria for MCI due to AD have a radical importance since they are potentially applicable in the clinical or research protocols and in all clinical settings where such markers are available. They provide a useful, consistent and valuable tool to homogenize the subgroup of patients with MCI who already has AD in a predementia phase with inexorable progression to dementia by AD over the years.

12-item version of Boston Naming Test: usefulness in the diagnosis of primary progressive aphasia, frontotemporal dementia, and Alzheimer's disease.

The 12-item version of the Boston Naming Test (BNT) was adapted to Argentina for the detection of dementia due to Alzheimer's disease (AD), with scores similar to the original 60-item version (sensitivity and specificity of 85 and 94%, respectively) without demographic influence (age and educational level). To date, no publications on the use of abbreviated BNT in other degenerative pathologies with language impairment have been reported. Objective: The objective of this study was to evaluate the usefulness of 12-item BNT in primary progressive aphasia (PPA), the behavioral variant of frontotemporal dementia (FTDbv), and AD. Methods: Notably, 47 patients with probable AD (NIA-AA 2011) - clinical dementia rating (CDR) 0.5-1, 55 with FTDbv, 17 with PPA, and 46 controls were evaluated and matched for age and education. Exclusion criteria were as follows: alcoholism, other previous neurological or psychiatric illnesses, and education <4 years. All were assessed with a full neuropsychological battery and a 12-item version of BNT. Results: Median scores of 12-item BNT were as follows: PPA: 3.87 (SD=2.99), AD: 6.13 (SD=3.03); FTDbv: 8.41 (SD=2.53); and controls: 10.22 (SD=1.82). Receiver Operating Characteristic (ROC) curves were plotted. Conclusions: The 12-item version of BNT can be useful, simple, and fast to identify and differentiate PPA, FTDbv, and AD from controls while retaining the discriminative ability of the original version.

A versão de 12 itens do Teste de Nomeação de Boston (TNB) foi adaptada para a Argentina para a detecção de demência por doença de Alzheimer (DA), com escores semelhantes à versão original de 60 itens (sensibilidade e especificidade de 85 e 94%, respectivamente) sem influência demográfica (idade e escolaridade). Até o momento, não foram relatadas publicações sobre o uso do TNB abreviado em outras patologias degenerativas com comprometimento da linguagem. Objetivo: avaliar a utilidade do TNB de 12 itens na afasia progressiva primária (APP), na variante comportamental da demência frontotemporal (DFT) e na doença de Alzheimer (DA). Métodos: 47 prováveis DA (NIA-AA 2011) ­ CDR 0,5­1, 55 DFT, 17 APP e 46 controles foram avaliados e pareados por idade e escolaridade. Critérios de exclusão: alcoolismo, outras doenças neurológicas ou psiquiátricas prévias e escolaridade <4 anos. Todos foram avaliados com uma bateria neuropsicológica completa e versão de 12 itens do TNB. Resultados: medianas das pontuações de 12 itens TNB: APP: 3,87 (DP=2,99), DA: 6,13 (DP=3,03); DFT: 8,41 (DP=2,53) e Controles: 10,22 (DP=1,82). As curvas ROC foram traçadas. Conclusões: O TNB de 12 itens pode ser útil, simples e rápido para identificar e diferenciar APP, DFT e DA nos controles, mantendo a capacidade discriminativa da versão original.

Self-Esteem, Happiness, and Flourishing in Times of COVID-19: A Study During the Lockdown Period in Ecuador.

Objective: Several studies have investigated the negative toll the pandemic has had on people's mental health. However, there is limited research on the pandemic's effect on positive mental health variables. This article reports on the levels of self-esteem and well-being (flourishing and happiness) in a sample of adults living in Ecuador and their relationships with the characteristics of their personal situation and the effects of the COVID-19 pandemic had on their personal lives. Methods: A total of 766 adults completed an anonymous online survey between March and August 2020. Results: Participants reported average scores in the flourishing scale, the majority considered themselves to be happy or very happy people, and more than half presented high levels of self-esteem. Age, education, socioeconomic status, time spent using mobile phones and on hobbies, among others, explained self-esteem, happiness, and flourishing. Conclusion: The relationships between sociodemographic and situational variables of confinement during the pandemic are discussed, as well as the possible predictors of happiness, flourishing, and self-esteem.

Clinical and economic characteristics associated with direct costs of Alzheimer's, frontotemporal and vascular dementia in Argentina.

BACKGROUND: The economic cost of dementia is high and can be predicted by cognitive and neuropsychiatric profiles. The differential costs of the various subtypes of dementia are unknown in Argentina, and this study therefore aimed to compare these costs. METHODS: Patients with a diagnosis of dementia of Alzheimer-type (DAT), frontotemporal dementia (FTD) and vascular dementia (VaD), and their primary caregivers, were evaluated between 2002 and 2008. RESULTS: 104 patients with dementia (DAT = 44, FTD = 34, VaD = 26) were screened and matched by age and educational level with 29 healthy subjects. Demographic variables showed no significant differences among dementia patients. The annual direct costs were US$4625 for DAT, US$4924 for FTD, and US$5112 for VaD (p > 0.05 between groups). In the post hoc analysis VaD showed higher hospitalization costs than DAT (p < 0.001). VaD exhibited lower medication costs than FTD (p < 0.001). DAT exhibited higher anti-dementia drug costs; FTD had higher psychotropic costs. In the multivariate analysis, depression, activities of daily living, and caregiver burden were correlated with direct costs (r2 = 0.76). CONCLUSIONS: The different dementia types have different costs. Overall, costs increased with the presence of behavioral symptoms, depression and functional impairment of activities of daily living.