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1.
Hum Brain Mapp ; 45(14): e70033, 2024 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-39319686

RESUMEN

Temporal lobe epilepsy (TLE) frequently involves an intricate, extensive epileptic frontal-temporal network. This study aimed to investigate the interactions between temporal and frontal regions and the dynamic patterns of the frontal-temporal network in TLE patients with different disease durations. The magnetoencephalography data of 36 postoperative seizure-free patients with long-term follow-up of at least 1 year, and 21 age- and sex-matched healthy subjects were included in this study. Patients were initially divided into LONG-TERM (n = 18, DURATION >10 years) and SHORT-TERM (n = 18, DURATION ≤10 years) groups based on 10-year disease duration. For reliability, supplementary analyses were conducted with alternative cutoffs, creating three groups: 0 < DURATION ≤7 years (n = 11), 7 < DURATION ≤14 years (n = 11), and DURATION >14 years (n = 14). This study examined the intraregional phase-amplitude coupling (PAC) between theta phase and alpha amplitude across the whole brain. The interregional directed phase transfer entropy (dPTE) between frontal and temporal regions in the alpha and theta bands, and the interregional cross-frequency directionality (CFD) between temporal and frontal regions from the theta phase to the alpha amplitude were further computed and compared among groups. Partial correlation analysis was conducted to investigate correlations between intraregional PAC, interregional dPTE connectivity, interregional CFD, and disease duration. Whole-brain intraregional PAC analyses revealed enhanced theta phase-alpha amplitude coupling within the ipsilateral temporal and frontal regions in TLE patients, and the ipsilateral temporal PAC was positively correlated with disease duration (r = 0.38, p <.05). Interregional dPTE analyses demonstrated a gradual increase in frontal-to-temporal connectivity within the alpha band, while the direction of theta-band connectivity reversed from frontal-to-temporal to temporal-to-frontal as the disease duration increased. Interregional CFD analyses revealed that the inhibitory effect of frontal regions on temporal regions gradually increased with prolonged disease duration (r = -0.36, p <.05). This study clarified the intrinsic reciprocal connectivity between temporal and frontal regions with TLE duration. We propose a dynamically reorganized triple-stage network that transitions from balanced networks to constrained networks and further develops into imbalanced networks as the disease duration increases.


Asunto(s)
Conectoma , Epilepsia del Lóbulo Temporal , Lóbulo Frontal , Magnetoencefalografía , Red Nerviosa , Lóbulo Temporal , Humanos , Epilepsia del Lóbulo Temporal/fisiopatología , Epilepsia del Lóbulo Temporal/cirugía , Epilepsia del Lóbulo Temporal/diagnóstico por imagen , Masculino , Femenino , Adulto , Adulto Joven , Lóbulo Frontal/fisiopatología , Lóbulo Frontal/diagnóstico por imagen , Red Nerviosa/fisiopatología , Red Nerviosa/diagnóstico por imagen , Lóbulo Temporal/fisiopatología , Lóbulo Temporal/diagnóstico por imagen , Persona de Mediana Edad , Ritmo Teta/fisiología , Ritmo alfa/fisiología , Adolescente
2.
Nat Commun ; 15(1): 7827, 2024 Sep 07.
Artículo en Inglés | MEDLINE | ID: mdl-39244544

RESUMEN

The ability to switch between rules associating stimuli and responses depend on a circuit including the dorsomedial prefrontal cortex (dmPFC) and the subthalamic nucleus (STN). However, the precise neural implementations of switching remain unclear. To address this issue, we recorded local field potentials from the STN and from the dmPFC of neuropsychiatric patients during behavioral switching. Drift-diffusion modeling revealed that switching is associated with a shift in the starting point of evidence accumulation. Theta activity increases in dmPFC and STN during successful switch trials, while temporally delayed and excessive levels of theta lead to premature switch errors. This seemingly opposing impact of increased theta in successful and unsuccessful switching is explained by a negative correlation between theta activity and the starting point. Together, these results shed a new light on the neural mechanisms underlying the rapid reconfiguration of stimulus-response associations, revealing a Goldilocks' effect of theta activity on switching behavior.


Asunto(s)
Corteza Prefrontal , Núcleo Subtalámico , Ritmo Teta , Humanos , Corteza Prefrontal/fisiología , Ritmo Teta/fisiología , Masculino , Femenino , Adulto , Núcleo Subtalámico/fisiología , Persona de Mediana Edad , Estimulación Encefálica Profunda
3.
Science ; 385(6713): 1120-1127, 2024 Sep 06.
Artículo en Inglés | MEDLINE | ID: mdl-39236189

RESUMEN

New memories are integrated into prior knowledge of the world. But what if consecutive memories exert opposing demands on the host brain network? We report that acquiring a robust (food-context) memory constrains the mouse hippocampus within a population activity space of highly correlated spike trains that prevents subsequent computation of a flexible (object-location) memory. This densely correlated firing structure developed over repeated mnemonic experience, gradually coupling neurons in the superficial sublayer of the CA1 stratum pyramidale to whole-population activity. Applying hippocampal theta-driven closed-loop optogenetic suppression to mitigate this neuronal recruitment during (food-context) memory formation relaxed the topological constraint on hippocampal coactivity and restored subsequent flexible (object-location) memory. These findings uncover an organizational principle for the peer-to-peer coactivity structure of the hippocampal cell population to meet memory demands.


Asunto(s)
Región CA1 Hipocampal , Memoria , Optogenética , Ritmo Teta , Animales , Masculino , Potenciales de Acción , Región CA1 Hipocampal/fisiología , Región CA1 Hipocampal/citología , Memoria/fisiología , Neuronas/fisiología , Células Piramidales/fisiología
4.
Sci Rep ; 14(1): 21482, 2024 09 14.
Artículo en Inglés | MEDLINE | ID: mdl-39277643

RESUMEN

We reconcile two significant lines of Cognitive Neuroscience research: the relationship between the structural and functional architecture of the brain and behaviour on the one hand and the functional significance of oscillatory brain processes to behavioural performance on the other. Network neuroscience proposes that the three elements, behavioural performance, EEG oscillation frequency, and network connectivity should be tightly connected at the individual level. Young and old healthy adults were recruited as a proxy for performance variation. An auditory inhibitory control task was used to demonstrate that task performance correlates with the individual EEG frontal theta frequency. Older adults had a significantly slower theta frequency, and both theta frequency and task performance correlated with the strengths of two network connections that involve the main areas of inhibitory control and speech processing. The results suggest that both the recruited functional network and the oscillation frequency induced by the task are specific to the task, are inseparable, and mark individual differences that directly link structure and function to behaviour in health and disease.


Asunto(s)
Cognición , Electroencefalografía , Análisis y Desempeño de Tareas , Ritmo Teta , Humanos , Masculino , Femenino , Adulto , Ritmo Teta/fisiología , Cognición/fisiología , Adulto Joven , Anciano , Individualidad , Encéfalo/fisiología , Red Nerviosa/fisiología , Persona de Mediana Edad
5.
J Exp Psychol Gen ; 153(9): 2279-2298, 2024 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-39235889

RESUMEN

As we interpret language moment by moment, we often encounter conflicting cues in the input that create incompatible representations of sentence meaning, which must be promptly resolved. Although ample evidence suggests that cognitive control aids in the resolution of such conflict, the methods commonly used to assess cognitive control's involvement in language comprehension provide limited information about the time course of its engagement. Here, we show that neural oscillatory activity in the theta-band (∼3-8 Hz), which is associated with cognitive control in nonlinguistic tasks like Stroop and Flanker, provides a real-time index of cognitive control during language processing. We conducted time-frequency analyses of four electroencephalogram data sets, and consistently observed that increased theta-band power was elicited by various kinds of linguistic conflict. Moreover, increases in the degree of conflict within a sentence produced greater increases in theta activity. These effects emerged as early as 300 ms from the onset of the initiating event, indicating rapid cognitive-control recruitment during sentence processing in response to conflicting representations. Crucially, the effect patterns could not be ascribed to processing difficulty that is not due to conflict (e.g., semantic implausibility was neither necessary nor sufficient to elicit theta activity). We suggest that neural oscillations in the theta-band offer a reliable way to test specific hypotheses about cognitive-control engagement during real-time language comprehension. (PsycInfo Database Record (c) 2024 APA, all rights reserved).


Asunto(s)
Comprensión , Electroencefalografía , Lenguaje , Ritmo Teta , Humanos , Ritmo Teta/fisiología , Masculino , Femenino , Adulto , Adulto Joven , Comprensión/fisiología , Cognición/fisiología , Conflicto Psicológico , Función Ejecutiva/fisiología
6.
Cereb Cortex ; 34(9)2024 Sep 03.
Artículo en Inglés | MEDLINE | ID: mdl-39233376

RESUMEN

Repeated exposure to word forms and meanings improves lexical knowledge acquisition. However, the roles of domain-general and language-specific brain regions during this process remain unclear. To investigate this, we applied intermittent theta burst stimulation over the domain-general (group left dorsolateral prefrontal cortex) and domain-specific (Group L IFG) brain regions, with a control group receiving sham intermittent theta burst stimulation. Intermittent theta burst stimulation effects were subsequently assessed in functional magnetic resonance imaging using an artificial word learning task which consisted of 3 learning phases. A generalized psychophysiological interaction analysis explored the whole brain functional connectivity, while dynamic causal modeling estimated causal interactions in specific brain regions modulated by intermittent theta burst stimulation during repeated exposure. Compared to sham stimulation, active intermittent theta burst stimulation improved word learning performance and reduced activation of the left insula in learning phase 2. Active intermittent theta burst stimulation over the domain-general region increased whole-brain functional connectivity and modulated effective connectivity between brain regions during repeated exposure. This effect was not observed when active intermittent theta burst stimulation was applied to the language-specific region. These findings suggest that the domain-general region plays a crucial role in word formation rule learning, with intermittent theta burst stimulation enhancing whole-brain connectivity and facilitating efficient information exchange between key brain regions during new word learning.


Asunto(s)
Encéfalo , Lenguaje , Imagen por Resonancia Magnética , Estimulación Magnética Transcraneal , Humanos , Masculino , Femenino , Adulto Joven , Estimulación Magnética Transcraneal/métodos , Encéfalo/fisiología , Encéfalo/diagnóstico por imagen , Adulto , Cognición/fisiología , Mapeo Encefálico , Aprendizaje/fisiología , Ritmo Teta/fisiología , Aprendizaje Verbal/fisiología , Vías Nerviosas/fisiología
7.
Schizophr Res ; 272: 112-119, 2024 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-39214021

RESUMEN

Impaired visual target detection is a common finding in schizophrenia that is linked to poor functional outcomes. However, the neural mechanisms that contribute to this deficit remain unclear. Recent research in healthy samples has identified relationships between the phase of pre-stimulus electroencephalographic (EEG) activity in the alpha band (8-12 Hz) or theta band (4-7 Hz) and the likelihood of visual target detection with and without attentional cueing, but these effects have not yet been explored in schizophrenia. We performed a study to investigate such effects in schizophrenia (n = 19) and healthy participants (n = 14), using a visual target detection task with attentional cues. We found significant relationships between pre-stimulus EEG phase properties and visual target detection in both groups, but also clear differences in the effects as a function of frequency, group, and attentional cueing. Alpha-band phase effects were relatively uniform across groups and conditions. By contrast, theta-band phase effects showed differences by group and attentional condition which could be consistent with attentional hyperfocusing in the schizophrenia group. Thus, our results elucidate a novel neural mechanism that may help to explain known impairments affecting both visual target detection and attention in schizophrenia.


Asunto(s)
Atención , Electroencefalografía , Esquizofrenia , Humanos , Esquizofrenia/fisiopatología , Esquizofrenia/diagnóstico , Masculino , Femenino , Adulto , Proyectos Piloto , Atención/fisiología , Señales (Psicología) , Adulto Joven , Percepción Visual/fisiología , Estimulación Luminosa , Ritmo Teta/fisiología , Persona de Mediana Edad
8.
Artículo en Inglés | MEDLINE | ID: mdl-39133582

RESUMEN

Embodied cognition explores the intricate interaction between the brain, body, and the surrounding environment. The advancement of mobile devices, such as immersive interactive computing and wireless electroencephalogram (EEG) devices, has presented new challenges and opportunities for studying embodied cognition. To address how mobile technology within immersive hybrid settings affects embodied cognition, we propose a target detection multitask incorporating mixed body movement interference and an environmental distraction light signal. We aim to investigate human embodied cognition in immersive projector-based augmented reality (IPAR) scenarios using wireless EEG technology. We recruited and engaged fifteen participants in four multitasking conditions: standing without distraction (SND), walking without distraction (WND), standing with distraction (SD), and walking with distraction (WD). We pre-processed the EEG data using Independent Component Analysis (ICA) to isolate brain sources and K-means clustering to categorize Independent Components (ICs). Following that, we conducted time-frequency and correlation analyses to identify neural dynamics changes associated with multitasking. Our findings reveal a decline in behavioral performance during multitasking activities. We also observed decreases in alpha and beta power in the frontal and motor cortex during standing target search tasks, decreases in theta power, and increases in alpha power in the occipital lobe during multitasking. We also noted perturbations in theta band power during distraction tasks. Notably, physical movement induced more significant fluctuations in the frontal and motor cortex than distractions from social environment light signals. Particularly in scenarios involving walking and multitasking, there was a noticeable reduction in beta suppression. Our study underscores the importance of brain-body collaboration in multitasking scenarios, where the simultaneous engagement of the body and brain in complex tasks highlights the dynamic nature of cognitive processes within the framework of embodied cognition. Furthermore, integrating immersive augmented reality technology into embodied cognition research enhances our understanding of the interplay between the body, environment, and cognitive functions, with profound implications for advancing human-computer interaction and elucidating cognitive dynamics in multitasking.


Asunto(s)
Realidad Aumentada , Cognición , Electroencefalografía , Caminata , Humanos , Masculino , Femenino , Cognición/fisiología , Adulto , Adulto Joven , Caminata/fisiología , Encéfalo/fisiología , Comportamiento Multifuncional/fisiología , Posición de Pie , Tecnología Inalámbrica , Atención/fisiología , Voluntarios Sanos , Ritmo Teta/fisiología , Ritmo beta/fisiología , Interfaces Cerebro-Computador
9.
Neurobiol Dis ; 200: 106643, 2024 Oct 01.
Artículo en Inglés | MEDLINE | ID: mdl-39173846

RESUMEN

Down syndrome (DS) is the most common cause of intellectual disability, yet little is known about the neurobiological pathways leading to cognitive impairments. Electroencephalographic (EEG) measures are commonly used to study neurodevelopmental disorders, but few studies have focused on young children with DS. Here we assess resting state EEG data collected from toddlers/preschoolers with DS (n = 29, age 13-48 months old) and compare their aperiodic and periodic EEG features with both age-matched (n = 29) and developmental-matched (n = 58) comparison groups. DS participants exhibited significantly reduced aperiodic slope, increased periodic theta power, and decreased alpha peak amplitude. A majority of DS participants displayed a prominent peak in the theta range, whereas a theta peak was not present in age-matched participants. Overall, similar findings were also observed when comparing DS and developmental-matched groups, suggesting that EEG differences are not explained by delayed cognitive ability.


Asunto(s)
Síndrome de Down , Electroencefalografía , Humanos , Síndrome de Down/fisiopatología , Masculino , Femenino , Electroencefalografía/métodos , Lactante , Preescolar , Encéfalo/fisiopatología , Ritmo Teta/fisiología , Ondas Encefálicas/fisiología
10.
Cell Rep ; 43(8): 114590, 2024 Aug 27.
Artículo en Inglés | MEDLINE | ID: mdl-39163200

RESUMEN

The hippocampus and medial entorhinal cortex (MEC) form a cognitive map that facilitates spatial navigation. As part of this map, MEC grid cells fire in a repeating hexagonal pattern across an environment. This grid pattern relies on inputs from the medial septum (MS). The MS, and specifically GABAergic neurons, are essential for theta rhythm oscillations in the entorhinal-hippocampal network; however, the role of this population in grid cell function is unclear. To investigate this, we use optogenetics to inhibit MS-GABAergic neurons and observe that MS-GABAergic inhibition disrupts grid cell spatial periodicity. Grid cell spatial periodicity is disrupted during both optogenetic inhibition periods and short inter-stimulus intervals. In contrast, longer inter-stimulus intervals allow for the recovery of grid cell spatial firing. In addition, grid cell phase precession is also disrupted. These findings highlight the critical role of MS-GABAergic neurons in maintaining grid cell spatial and temporal coding in the MEC.


Asunto(s)
Corteza Entorrinal , Neuronas GABAérgicas , Células de Red , Optogenética , Neuronas GABAérgicas/metabolismo , Neuronas GABAérgicas/fisiología , Animales , Corteza Entorrinal/fisiología , Corteza Entorrinal/metabolismo , Corteza Entorrinal/citología , Células de Red/fisiología , Ratones , Masculino , Ritmo Teta/fisiología , Núcleos Septales/fisiología , Núcleos Septales/metabolismo
11.
Neuroscience ; 558: 122-127, 2024 Oct 18.
Artículo en Inglés | MEDLINE | ID: mdl-39168176

RESUMEN

BACKGROUND: Ovarian hormones influence the propensity for short-term plasticity induced by repetitive transcranial magnetic stimulation (rTMS). Estradiol appears to enhance the propensity for neural plasticity. It is currently unknown how progesterone influences short-term plasticity induced by rTMS. OBJECTIVE: The present research investigates whether the luteal versus follicular phase of the menstrual cycle influence short-term plasticity induced by intermittent theta-burst stimulation (iTBS). We tested the hypothesis that iTBS would increase motor evoked potentials (MEPs) during the follicular phase. Further, we explored the effects of the luteal phase on iTBS-induced neural plasticity. METHOD: Twenty-nine adult females participated in a placebo-controlled study that delivered real and sham iTBS to the left primary motor cortex in separate sessions corresponding to the follicular phase (real iTBS), luteal phase (real iTBS), and a randomly selected day (sham iTBS). Outcomes included corticospinal excitability as measured by the amplitude of MEPs and short-interval intracortical inhibition (SICI) recorded from the right first dorsal interosseous muscle before and following iTBS (612 pulses). RESULTS: MEP amplitude was increased following real iTBS during the follicular condition. No significant changes in MEP amplitude were observed during the luteal or sham visits. SICI was unchanged by iTBS irrespective of menstrual phase. CONCLUSION: These findings suggest women experience a variable propensity for iTBS-induced short-term plasticity across the menstrual cycle. This information is important for designing studies aiming to induce plasticity via rTMS in women.


Asunto(s)
Potenciales Evocados Motores , Ciclo Menstrual , Corteza Motora , Plasticidad Neuronal , Estimulación Magnética Transcraneal , Humanos , Femenino , Plasticidad Neuronal/fisiología , Potenciales Evocados Motores/fisiología , Adulto , Corteza Motora/fisiología , Adulto Joven , Ciclo Menstrual/fisiología , Electromiografía , Ritmo Teta/fisiología , Inhibición Neural/fisiología
12.
Brain Cogn ; 180: 106209, 2024 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-39137602

RESUMEN

Adolescents are at relatively high-risk for developing anxiety, particularly social anxiety. A primary hallmark of social anxiety is the impulse to avoid situations that introduce risk. Here, we examined the neural and behavioral correlates of risk avoidance in adolescents (N=59) 11 to 19 years of age. The Balloon Risk Avoidance Task was used with concurrent electroencephalography to measure event-related potentials (frontal P2; late slow-wave; N2, feedback-related negativity, FRN; posterior P3) and oscillatory dynamics (midfrontal theta, 4-7 Hz) in response to unsuccessful and successful risk avoidance conditions. Social anxiety was measured using the Social Phobia and Anxiety Inventory for Children. Results indicated that, across the whole sample, youth exhibited smaller P3, larger FRN, and larger theta responses to unsuccessful risk avoidance. Youth reporting high (compared to low) levels of social anxiety exhibited larger P2, slow-wave, and FRN responses to unsuccessful, compared to successful, risk avoidance. Further, greater social anxiety was associated with reduced theta responses to successful avoidance. Youth with higher levels of social anxiety showed smaller theta responses to both conditions compared to those with low levels of social anxiety. Taken together, the ERP-component differences and weakened theta power in socially anxious youth following unsuccessful avoidance are informative neural correlates for socially anxious youth during risk avoidance.


Asunto(s)
Ansiedad , Electroencefalografía , Potenciales Evocados , Ritmo Teta , Humanos , Adolescente , Masculino , Femenino , Potenciales Evocados/fisiología , Ritmo Teta/fisiología , Niño , Electroencefalografía/métodos , Ansiedad/fisiopatología , Adulto Joven , Reacción de Prevención/fisiología , Fobia Social/fisiopatología , Asunción de Riesgos , Encéfalo/fisiopatología , Encéfalo/fisiología
13.
J Neural Transm (Vienna) ; 131(9): 1105-1115, 2024 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-39105815

RESUMEN

In adults affected by Major Depressive Disorder (MDD), most findings point to higher electroencephalographic (EEG) theta power during wake compared to healthy controls (HC) as a potential biomarker aiding the diagnostic process or subgrouping for stratified treatment. Besides these group differences, theta power is modulated by time of day, sleep/wake history, and age. Thus, we aimed at assessing if the time of recording alters theta power in teenagers affected by MDD or HC. Standardized wake EEG power was assessed with high-density EEG in 15 children and adolescents with MDD and in 15 age- and sex-matched HC in the evening and morning. Using a two-way ANOVA, group, time, and their interaction were tested. In patients, the current severity of depression was rated using the Children's Depression Rating Scale. Broadband EEG power was lower in the morning after sleep, with a significant interaction (group x time) in central regions in the 4-6 Hz range. In MDD relative to HC, theta power was decreased over occipital areas in the evening and increased over frontal areas in the morning. A higher frontal theta power was correlated with more severe depressive mood in the morning but not in the evening. This was a cross-sectional study design, including patients on antidepressant medication. In conclusion, depending on time of recording, region-specific opposite differences of theta power were found between teenagers with MDD and HC. These findings stress the importance of the time of the recording when investigating theta power's relationship to psychopathology.


Asunto(s)
Trastorno Depresivo Mayor , Electroencefalografía , Ritmo Teta , Humanos , Trastorno Depresivo Mayor/fisiopatología , Adolescente , Masculino , Femenino , Ritmo Teta/fisiología , Estudios Transversales , Niño , Corteza Cerebral/fisiopatología , Factores de Tiempo , Sueño/fisiología
14.
Int J Mol Sci ; 25(16)2024 Aug 16.
Artículo en Inglés | MEDLINE | ID: mdl-39201597

RESUMEN

One of the major breakthroughs of neurobiology was the identification of distinct ranges of oscillatory activity in the neuronal network that were found to be responsible for specific biological functions, both physiological and pathological in nature. Astrocytes, physically coupled by gap junctions and possessing the ability to simultaneously modulate the functions of a large number of surrounding synapses, are perfectly positioned to introduce synchronised oscillatory activity into the neural network. However, astrocytic somatic calcium signalling has not been investigated to date in the frequency ranges of common neuronal oscillations, since astrocytes are generally considered to be slow responders in terms of Ca2+ signalling. Using high-frequency two-photon imaging, we reveal fast Ca2+ oscillations in the soma of astrocytes in the delta (0.5-4 Hz) and theta (4-8 Hz) frequency bands in vivo in the rat cortex under ketamine-xylazine anaesthesia, which is known to induce permanent slow-wave sleep. The high-frequency astrocytic Ca2+ signals were not observed under fentanyl anaesthesia, excluding the possibility that the signals were introduced by motion artefacts. We also demonstrate that these fast astrocytic Ca2+ signals, previously considered to be exclusive to neurons, are present in a large number of astrocytes and are phase synchronised at the astrocytic network level. We foresee that the disclosure of these high-frequency astrocytic signals may help with understanding the appearance of synchronised oscillatory signals and may open up new avenues of treatment for neurological conditions characterised by altered neuronal oscillations.


Asunto(s)
Astrocitos , Señalización del Calcio , Calcio , Astrocitos/metabolismo , Animales , Ratas , Calcio/metabolismo , Masculino , Ritmo Teta/fisiología , Ritmo Delta , Neuronas/metabolismo , Neuronas/fisiología
15.
Spinal Cord Ser Cases ; 10(1): 56, 2024 Aug 04.
Artículo en Inglés | MEDLINE | ID: mdl-39098854

RESUMEN

INTRODUCTION: Spinal cord injury (SCI) causes damage to neurons and results in motor and sensory dysfunction. Intermittent theta burst stimulation (iTBS) has been used to induce neuronal and synaptic plasticity by applying a magnetic field in the brain. The plasticity induced in the cortex has an imperative role in the recovery of motor and sensory functioning. However, the effect of iTBS in complete SCI patients is still elusive. CASE PRESENTATION: We report here the case of a 27-year-old female who sustained an L1 complete spinal cord injury (SCI) with an ASIA score of A. The patient lost all the sensory and motor functions below the level of injury. Intermittent theta burst stimulation (iTBS) was administered at 80% of the resting motor threshold over the M1 motor cortex, along with intensive rehabilitation training to promote sensorimotor function. DISCUSSION: There was a partial recovery in functional, electrophysiological, and neurological parameters. The case report also demonstrates the safety and efficacy of iTBS in complete SCI patients. No adverse event has been observed in the patient during intervention sessions.


Asunto(s)
Traumatismos de la Médula Espinal , Estimulación Magnética Transcraneal , Humanos , Traumatismos de la Médula Espinal/rehabilitación , Traumatismos de la Médula Espinal/complicaciones , Traumatismos de la Médula Espinal/terapia , Traumatismos de la Médula Espinal/fisiopatología , Femenino , Adulto , Estimulación Magnética Transcraneal/métodos , Recuperación de la Función/fisiología , Corteza Motora , Ritmo Teta/fisiología
16.
Cereb Cortex ; 34(8)2024 Aug 01.
Artículo en Inglés | MEDLINE | ID: mdl-39110414

RESUMEN

Adaptive behavior is fundamental to cognitive control and executive functioning. This study investigates how cognitive control mechanisms and episodic feature retrieval interact to influence adaptiveness, focusing particularly on theta (4 to 8 Hz) oscillatory dynamics. We conducted two variations of the Simon task, incorporating response-incompatible, response-compatible, and neutral trials. Experiment 1 demonstrated that cognitive adjustments-specifically, cognitive shielding following incompatible trials and cognitive relaxation following compatible ones-are reflected in midfrontal theta power modulations associated with the Simon effect. Experiment 2 showed that reducing feature overlap between trials leads to less pronounced sequential modulations in behavior and midfrontal theta activity, supporting the hypothesis that cognitive control and feature integration share a common neural mechanism. These findings highlight the interaction of cognitive control processes and episodic feature integration in modulating behavior. The results advocate for hybrid models that combine top-down and bottom-up processes as a comprehensive framework to understand cognitive control dynamics and adaptive behavior.


Asunto(s)
Cognición , Conflicto Psicológico , Función Ejecutiva , Ritmo Teta , Humanos , Ritmo Teta/fisiología , Masculino , Femenino , Adulto Joven , Cognición/fisiología , Adulto , Función Ejecutiva/fisiología , Tiempo de Reacción/fisiología , Electroencefalografía , Desempeño Psicomotor/fisiología , Adaptación Psicológica/fisiología , Encéfalo/fisiología
17.
Transl Psychiatry ; 14(1): 321, 2024 Aug 06.
Artículo en Inglés | MEDLINE | ID: mdl-39107266

RESUMEN

Obsessive-compulsive disorder (OCD) is a clinically challenging and refractory psychiatric disorder characterized by pathologically hyperactivated brain activity. Continuous theta burst stimulation (cTBS) is considered a potentially non-invasive treatment for inducing inhibitory effects on the underlying cortex. Numerous studies showed an unsatisfactory efficacy of cTBS for OCD. Accordingly, it seems that cTBS is ineffective for OCD. However, the neglect of varying OCD severities, modest sample size, absence of a multicenter design incorporating inpatients and outpatients, and lack of personalized imaging-guided targeting may constrain the conclusive findings of cTBS efficacy for OCD. In the preliminary experiment, 50 inpatients with OCD were enrolled to receive cTBS (10 sessions/day for five continuous days) or sham over the personalized right pre-supplementary motor area determined by the highest functional connectivity with the subthalamic nucleus according to our prior study. In the extension experiment, 32 outpatients with OCD received cTBS to generalize the treatment effects. The Yale-Brown Obsessive-Compulsive Scale (YBOCS) was assessed before and after treatment. In the preliminary experiment, the response rates in the cTBS group were 56.52%, respectively, significantly higher than those in the sham group. Further analysis revealed significant YBOCS improvement in patients with moderate OCD symptoms than those with severe OCD symptoms. In the extension experiment, the response rates were 50.00%. Additionally, a significant decrease in YBOCS scores was only found in patients with moderate OCD symptoms. This is the first study with an external validation design across two centers to identify OCD symptoms as playing an important role in cTBS treatment effects, especially in patients with moderate OCD symptoms.


Asunto(s)
Trastorno Obsesivo Compulsivo , Estimulación Magnética Transcraneal , Humanos , Trastorno Obsesivo Compulsivo/terapia , Trastorno Obsesivo Compulsivo/fisiopatología , Masculino , Femenino , Adulto , Estimulación Magnética Transcraneal/métodos , Persona de Mediana Edad , Resultado del Tratamiento , Adulto Joven , Corteza Motora/fisiopatología , Ritmo Teta
18.
Nat Commun ; 15(1): 6982, 2024 Aug 14.
Artículo en Inglés | MEDLINE | ID: mdl-39143083

RESUMEN

Theta-burst stimulation (TBS), a patterned brain stimulation technique that mimics rhythmic bursts of 3-8 Hz endogenous brain rhythms, has emerged as a promising therapeutic approach for treating a wide range of brain disorders, though the neural mechanism of TBS action remains poorly understood. We investigated the neural effects of TBS using intracranial EEG (iEEG) in 10 pre-surgical epilepsy participants undergoing intracranial monitoring. Here we show that individual bursts of direct electrical TBS at 29 frontal and temporal sites evoked strong neural responses spanning broad cortical regions. These responses exhibited dynamic local field potential voltage changes over the course of stimulation presentations, including either increasing or decreasing responses, suggestive of short-term plasticity. Stronger stimulation augmented the mean TBS response amplitude and spread with more recording sites demonstrating short-term plasticity. TBS responses were stimulation site-specific with stronger TBS responses observed in regions with strong baseline stimulation effective (cortico-cortical evoked potentials) and functional (low frequency phase locking) connectivity. Further, we could use these measures to predict stable and varying (e.g. short-term plasticity) TBS response locations. Future work may integrate pre-treatment connectivity alongside other biophysical factors to personalize stimulation parameters, thereby optimizing induction of neuroplasticity within disease-relevant brain networks.


Asunto(s)
Encéfalo , Plasticidad Neuronal , Ritmo Teta , Humanos , Masculino , Adulto , Femenino , Ritmo Teta/fisiología , Encéfalo/fisiología , Plasticidad Neuronal/fisiología , Epilepsia/fisiopatología , Epilepsia/terapia , Adulto Joven , Red Nerviosa/fisiología , Persona de Mediana Edad , Electroencefalografía , Potenciales Evocados/fisiología , Estimulación Eléctrica/métodos , Electrocorticografía
19.
Appetite ; 201: 107616, 2024 Oct 01.
Artículo en Inglés | MEDLINE | ID: mdl-39098082

RESUMEN

In food choices, conflict arises when choosing between a healthy, but less tasty food item and a tasty, but less healthy food item. The underlying assumption is that people trade-off the health and taste properties of food items to reach a decision. To probe this assumption, we presented food items either as colored images (image condition, e.g. photograph of a granola bar) or as pre-matched percentages of taste and health values (text condition, e.g., 20% healthy and 80% tasty). We recorded choices, response times and electroencephalography activity to calculate mid-frontal theta power as a marker of conflict. At the behavioral level, we found higher response times for healthy compared to unhealthy choices, and for difficult compared to easy decisions in both conditions, indicating the experience of a decision conflict. At the neural level, mid-frontal theta power was higher for healthy choices than unhealthy choices and difficult choices compared to easy choices, but only in the image condition. Those results suggest that either conflict type and/or decision strategies differ between the image and text conditions. The present results can be helpful in understanding how dietary decisions can be influenced towards healthier food choices.


Asunto(s)
Conducta de Elección , Toma de Decisiones , Preferencias Alimentarias , Ritmo Teta , Humanos , Preferencias Alimentarias/psicología , Femenino , Masculino , Adulto Joven , Adulto , Electroencefalografía , Conflicto Psicológico , Tiempo de Reacción , Gusto/fisiología , Dieta Saludable/psicología , Adolescente
20.
Cereb Cortex ; 34(8)2024 Aug 01.
Artículo en Inglés | MEDLINE | ID: mdl-39118215

RESUMEN

Freedom of choice enhances our sense of agency. During goal-directed behavior, the freedom to choose between different response options increases the neural processing of positive and negative feedback, indicating enhanced outcome monitoring under conditions of high agency experience. However, it is unclear whether this enhancement is predominantly driven by an increased salience of self- compared to externally determined action outcomes or whether differences in the perceived instrumental value of outcomes contribute to outcome monitoring in goal-directed tasks. To test this, we recorded electroencephalography while participants performed a reinforcement learning task involving free choices, action-relevant forced choices, and action-irrelevant forced choices. We observed larger midfrontal theta power and N100 amplitudes for feedback following free choices compared with action-relevant and action-irrelevant forced choices. In addition, a Reward Positivity was only present for free but not forced choice outcomes. Crucially, our results indicate that enhanced outcome processing is not driven by the relevance of outcomes for future actions but rather stems from the association of outcomes with recent self-determined choice. Our findings highlight the pivotal role of self-determination in tracking the consequences of our actions and contribute to an understanding of the cognitive processes underlying the choice-induced facilitation in outcome monitoring.


Asunto(s)
Conducta de Elección , Electroencefalografía , Autonomía Personal , Humanos , Masculino , Femenino , Conducta de Elección/fisiología , Adulto Joven , Adulto , Recompensa , Potenciales Evocados/fisiología , Encéfalo/fisiología , Aprendizaje/fisiología , Refuerzo en Psicología , Ritmo Teta/fisiología
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