A5010456011- Neural and Behavioral Psychology Studies
- Functional Brain Connectivity Studies
- Neural dynamics and brain function
- Visual perception and processing mechanisms
- Neurobiology of Language and Bilingualism
- EEG and Brain-Computer Interfaces
- Face Recognition and Perception
- Reading and Literacy Development
- Sleep and Wakefulness Research
- Sleep and Work-Related Fatigue
- Olfactory and Sensory Function Studies
- Memory and Neural Mechanisms
- Cognitive and developmental aspects of mathematical skills
- Circadian rhythm and melatonin
- Free Will and Agency
- Heart Rate Variability and Autonomic Control
- Workplace Health and Well-being
- Psychology of Moral and Emotional Judgment
- COVID-19 Pandemic Impacts
- Neurological Disease Mechanisms and Treatments
- Sleep and related disorders
- Visual Attention and Saliency Detection
- Decision-Making and Behavioral Economics
- Consumer Retail Behavior Studies
- Psychosomatic Disorders and Their Treatments
National University of Singapore
1999-2025
Duke-NUS Medical School
2002-2016
Technische Universität Dresden
2013-2014
Bernstein Center for Computational Neuroscience Berlin
2010-2014
Charité - Universitätsmedizin Berlin
2010-2014
Humboldt-Universität zu Berlin
2014
Max Planck Institute for Human Cognitive and Brain Sciences
2008-2013
Otto-von-Guericke University Magdeburg
2013
SingHealth
2003-2006
Dartmouth College
2005
Unconscious neural activity has been repeatedly shown to precede and potentially even influence subsequent free decisions. However, date, such findings have mostly restricted simple motor choices, despite considerable debate, there is no evidence that the outcome of more complex decisions can be predicted from prior brain signals. Here, we show a decision either add or subtract numbers already decoded in medial prefrontal parietal cortex 4 s before participant reports they are consciously...
Several lines of evidence suggest the importance phonological working memory (PWM) in language acquisition. We investigated neural correlates PWM young adults who were under compelling social pressure to be bilingual. Equal bilinguals had high proficiency English and Chinese as measured by a standardized examination, whereas unequal proficient but not Chinese. Both groups matched on several measures nonverbal intelligence memory. In-scanner behavioral results did show between-group...
Recently, we demonstrated using functional magnetic resonance imaging (fMRI) that the outcome of free decisions can be decoded from brain activity several seconds before reaching conscious awareness. Activity patterns in anterior frontopolar cortex (BA 10) were temporally first to carry intention-related information and thus a candidate region for unconscious generation decisions. In present study, original paradigm was replicated multivariate pattern classification applied images cortex,...
Abstract The effect of word repetition within and across languages was studied in English-Chinese bilinguals who read rapidly presented pairs a block design an event-related fMRI study. Relatively less increase MR signal observed when the second pair identical meaning to first. This occurred English-only mixed-languages conditions. Repetition-induced reductions BOLD change were found left lateral prefrontal temporal regions both types conditions experiment, suggesting that processing these...
Previous work has suggested that object and place processing are neuroanatomically dissociated in ventral visual areas under conditions of passive viewing. It also been shown the hippocampus parahippocampal gyrus mediate integration objects with background scenes functional imaging studies, but only when encoding or retrieval processes have directed toward relevant stimuli. Using magnetic resonance adaptation, we demonstrated object, scene, contextual selectively repeated could be during...
COVID-19 lockdowns drastically affected sleep, physical activity, and wellbeing. We studied how these behaviors evolved during reopening the possible contributions of continued working from home smartphone usage.Participants (N = 198) were through lockdown subsequent period, using a wearable sleep/activity tracker, smartphone-delivered ecological momentary assessment (EMA), passive usage tracking. Work/study location was obtained daily EMA ascertainment.Upon reopening, earlier, shorter sleep...
Abstract The role of language in performing numerical computations has been a topic special interest cognition. “Triple Code Model” proposes the existence language-dependent verbal code involved retrieving arithmetic facts related to addition and multiplication, language-independent analog magnitude subserving tasks such as number comparison estimation. Neuroimaging studies have shown dissociation between dependence involving exact approximate processing on language-related circuits....
The Implicit Association Test (IAT) examines the differential association of two object categories (e.g. flower and insect) with attribute pleasant unpleasant). When items from congruent + pleasant) share a response key, performance is faster more accurate than when incongruent insect key. Performing word classification engages inhibitory processes to overcome prepotent tendency map emotionally same Using fMRI on subjects undergoing IAT, we show that left dorsolateral prefrontal cortex,...
Abstract Printed word frequency can modulate retrieval effort in a task requiring associative semantic judgment. Event‐related fMRI, while avoiding stimulus order predictability, is theory statistically less powerful than block designs. We compared one event‐related and two designs that evaluated the same judgment found similar brain regions demonstrated effect. Although responses were lower amplitude, fMRI was able to detect effect comparable degree The detection of with design also...
Abstract Using polysomnography over multiple weeks to characterize an individual’s habitual sleep behavior while accurate, is difficult upscale. As alternative, we integrated measurements from a consumer sleep-tracker, smartphone-based ecological momentary assessment, and user-phone interactions in 198 participants for 2 months. User retention averaged >80% all three modalities. Agreement bed wake time estimates across modalities was high (rho = 0.81–0.92) were adrift of one another...