Document Detail

Dynamics of oscillatory activity during auditory decision making.
MedLine Citation:
PMID:  17138595     Owner:  NLM     Status:  MEDLINE    
Perceptual decision making requires the comparison and integration of sensory evidence to generate a behavioral response. We used magnetoencephalography to investigate the temporal dynamics of decision making during an auditory task that required forced-choice decisions about whether a pair of syllables S1 and S2 differed either in their acoustic patterns or in the perceived position of their sound sources. Conditions with easy and difficult decisions were created by varying the similarity of S1 and S2. Statistical probability mapping showed enhanced gamma-band activity (GBA) over posterior parietal cortex for spatial and over left inferior frontal cortex for pattern changes (at approximately 120 to 220 ms after S2 onset). Activations were stronger for easy than difficult decisions. GBA over dorsolateral prefrontal cortex was more pronounced at approximately 280 to 430 ms for easy than difficult decisions regardless of type of change, possibly reflecting decision-relevant networks that integrate information from higher sensory areas representing the perceptual alternatives. Sensorimotor beta desynchronization as a measure of motor preparation peaked at approximately 460 ms for easy and at approximately 520 ms for difficult decisions, thus reflecting the reaction time difference between both conditions. In summary, the analysis of oscillatory activity in magnetoencephalogram served to elucidate the temporal dynamics of perceptual decision making in humans.
Jochen Kaiser; Therese Lennert; Werner Lutzenberger
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2006-11-30
Journal Detail:
Title:  Cerebral cortex (New York, N.Y. : 1991)     Volume:  17     ISSN:  1047-3211     ISO Abbreviation:  Cereb. Cortex     Publication Date:  2007 Oct 
Date Detail:
Created Date:  2007-09-04     Completed Date:  2007-11-13     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9110718     Medline TA:  Cereb Cortex     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2258-67     Citation Subset:  IM    
Institute of Medical Psychology, J. W. Goethe-University, Heinrich-Hoffmann-Strasse 10, 60528 Frankfurt am Main, Germany.
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MeSH Terms
Analysis of Variance
Auditory Perception*
Brain Mapping*
Decision Making*
Evoked Potentials / physiology*
Prefrontal Cortex / physiology*

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