Document Detail

The P50 evoked potential component and mismatch detection in normal volunteers: implications for the study of sensory gating.
MedLine Citation:
PMID:  7568563     Owner:  NLM     Status:  MEDLINE    
Sensory gating is a complex, multistage, multifaceted physiological function believed to be protecting higher cortical centers from being flooded with incoming irrelevant sensory stimuli. Failure of such mechanisms is hypothesized as one of the mechanisms underlying the development of psychotic states. Attenuation of the amplitude of the P50 evoked potential component with stimulus repetition is widely used to study sensory gating. In the current study, we investigated the responsiveness of the P50 component to changes in the physical characteristics of ongoing trains of auditory stimuli. Forty normal volunteers were studied in a modified oddball paradigm. At all cerebral locations studied, P50 amplitudes were higher in response to infrequent stimuli. We postulate that the increase in P50 amplitude reflects the system's recognition of novel stimuli or "gating in" of sensory input. The ratio of the amplitude of the responses to the infrequent stimuli to those of the frequent stimuli was significantly higher for the posterior temporal regions. This finding provides further evidence that the temporal lobes may be significantly involved in sensory gating processes. Although this study only included normal subjects, the data generated contribute to the understanding of sensory gating mechanisms that may be relevant to psychotic states.
N N Boutros; M W Torello; B A Barker; P A Tueting; S C Wu; H A Nasrallah
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Psychiatry research     Volume:  57     ISSN:  0165-1781     ISO Abbreviation:  Psychiatry Res     Publication Date:  1995 Jun 
Date Detail:
Created Date:  1995-11-21     Completed Date:  1995-11-21     Revised Date:  2008-04-17    
Medline Journal Info:
Nlm Unique ID:  7911385     Medline TA:  Psychiatry Res     Country:  IRELAND    
Other Details:
Languages:  eng     Pagination:  83-8     Citation Subset:  IM    
Department of Psychiatry, West Haven VA Medical Center (116A), CT 06516, USA.
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MeSH Terms
Attention / physiology*
Cerebral Cortex / physiopathology
Evoked Potentials, Auditory / physiology*
Neural Inhibition / physiology*
Psychotic Disorders / physiopathology,  psychology
Reference Values

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