Document Detail

Comparison of perceptual and motor decisions via confidence judgments and saccade curvature.
MedLine Citation:
PMID:  19261707     Owner:  NLM     Status:  MEDLINE    
This study investigated the effects on perceptual and motor decisions of low-contrast distractors, presented 5 degrees on the left and/or the right of the fixation point. Perceptual decisions were assessed with a yes/no (distractor) detection task. Motor decisions were assessed via these distractors' effects on the trajectory of an impending saccade to a distinct imperative stimulus, presented 10 degrees above fixation 50 ms after the distractor(s). Saccade curvature models postulate that distractors activate loci on a motor map that evoke reflexive saccades and that the distractor evoked activity is inhibited to prevent reflexive orienting to the cost of causing a saccade curvature away from the distractor. Depending on whether or not each of these processes depends on perceptual detection, one can predict the relationships between saccades' curvature and perceptual responses (classified as correct rejections, misses, false alarms, and hits). The results show that saccades curve away from distractors only when observers report them to be present. Furthermore, saccade deviation is correlated (on a trial-by-trial basis) with the inferred internal response associated with the perceptual report: the stronger the distractor-evoked perceptual response, the more saccades deviate away from the distractor. Also in contrast with a supersensitive motor system, perceptual sensitivity is systematically higher than the motor sensitivity derived from the distributions of the saccades' curvatures. Finally, when both distractors are present (and straight saccades are expected), the sign of saccades' curvature is correlated with observers' perceptual bias/criterion. Overall the results point to a strong perceptual-motor association.
Pedro Cardoso-Leite; Andrei Gorea
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-03-04
Journal Detail:
Title:  Journal of neurophysiology     Volume:  101     ISSN:  0022-3077     ISO Abbreviation:  J. Neurophysiol.     Publication Date:  2009 Jun 
Date Detail:
Created Date:  2009-05-27     Completed Date:  2009-08-03     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0375404     Medline TA:  J Neurophysiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2822-36     Citation Subset:  IM    
Laboratoire Psychologie de la Perception UMR 8158, Université Paris Descartes and Centre National de la Recherche Scientifique, 75006 Paris, France.
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MeSH Terms
Analysis of Variance
Attention / physiology*
Contrast Sensitivity / physiology
Decision Making / physiology*
Fixation, Ocular / physiology
Functional Laterality / physiology
Judgment / physiology*
Photic Stimulation / methods
ROC Curve
Reaction Time / physiology*
Reproducibility of Results
Saccades / physiology*

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

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