Document Detail

Event-related potentials in the frontal lobe during performance of a visual duration discrimination task.
MedLine Citation:
PMID:  14701996     Owner:  NLM     Status:  MEDLINE    
An event-related potential (ERP) study was conducted to elucidate the role of the prefrontal cortex (PFC) in time estimation. Subjects discriminated between three pairs of visual stimuli lasting from 100 ms and 2 seconds by determining whether the second stimulus was longer or briefer than the first. Event-related potentials were recorded in frontal and prefrontal regions after offset of the second stimulus (S2). The results indicated that the accuracy of the performances depended on stimulus duration and presentation order. In the brief-long order, the number of successful responses was higher as a function of stimulus duration. A time-related late positive component (LPCt) was revealed at prefrontal and frontal electrodes whose latency and amplitude differed depending on stimulus duration and order. The amplitude of this positive wave was higher when performance levels increased in the brief-long but not the reverse order. These results indicate that the LPCt may reflect successful decision-making or retrieval during time estimation as a result of neuronal activity in the PFC.
Isabelle Paul; Christophe Le Dantec; Christian Bernard; Robert Lalonde; Mohamed Rebaï
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Journal of clinical neurophysiology : official publication of the American Electroencephalographic Society     Volume:  20     ISSN:  0736-0258     ISO Abbreviation:  J Clin Neurophysiol     Publication Date:    2003 Sep-Oct
Date Detail:
Created Date:  2003-12-31     Completed Date:  2004-06-08     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8506708     Medline TA:  J Clin Neurophysiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  351-60     Citation Subset:  IM    
Université de Rouen, Faculté des Sciences, Laboratoire Psychologie et Neurosciences de la Cognition, Rouen Cedex, France.
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MeSH Terms
Analysis of Variance
Discrimination (Psychology) / physiology*
Electroencephalography / methods
Evoked Potentials, Visual / physiology*
Frontal Lobe / physiology*
Photic Stimulation / methods
Reaction Time / physiology,  radiation effects
Time Factors
Visual Perception / physiology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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