The timing of perceptual decisions for ambiguous face stimuli in the human ventral visual cortex.

The timing of perceptual decisions for ambiguous face stimuli in the human ventral visual cortex. Research Abstract Details 

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The timing of perceptual decisions for ambiguous face stimuli in the human ventral visual cortex. Abstract Text:

Thomas J McKeeff,Frank Tong,

When observers must discriminate a weak sensory signal in noise, early sensory areas seem to reflect the instantaneous strength of the sensory signal. In contrast, high-level parietal and prefrontal areas appear to integrate these signals over time with activity peaking at the time of the observer's decision. Here, we used functional magnetic resonance imaging to investigate how the brain forms perceptual decisions about complex visual forms in a challenging task, requiring the discrimination of ambiguous 2-tone Mooney faces and visually similar nonface images. Face-selective areas in the ventral visual cortex showed greater activity when subjects reported perceiving a face as compared with a nonface, even on error trials. More important, activity was closely related to the time of the subject's decision for face judgments, even on individual trials, and resembled the time course of activity in motor cortex corresponding to the subject's behavioral report. These results indicate that perceptual decisions about ambiguous face-like stimuli are reflected early in the sensorimotor pathway, in face-selective regions of the ventral visual cortex. Activity in these areas may represent a potential rate-limiting step in the pathway from sensation to action when subjects must reach a decision about ambiguous face-like stimuli.

The timing of perceptual decisions for ambiguous face stimuli in the human ventral visual cortex. Publishing Authors By Initials

TJ McKeeff,F Tong,

For similar nervous system: central nervous system: brain: prosencephalon: telencephalon: cerebrum: cerebral cortex: occipital lobe: visual cortex research abstracts see: nervous system: central nervous system: brain: prosencephalon: telencephalon: cerebrum: cerebral cortex: occipital lobe: visual cortex research

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The timing of perceptual decisions for ambiguous face stimuli in the human ventral visual cortex. Journal Published:

PUBLICATION TYPE: Research Support, N.I.H., Extr

Journal: Cerebral cortex (New York, N.Y. : 1991)

VOLUME: 17

Page Numbers: 669-78

Journal Abbreviation: Cereb. Cortex

ISSN: 1047-3211

DAY: 28

MONTH: 04

YEAR: 2006

The timing of perceptual decisions for ambiguous face stimuli in the human ventral visual cortex. Information

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LANGUAGE: eng

NlmUniqueID: 9110718

The timing of perceptual decisions for ambiguous face stimuli in the human ventral visual cortex. Keywords Mesh Terms:

KEYWORDS: Visual Cortex

MESH TERMS: physiology

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Grant and Affiliation Information for The timing of perceptual decisions for ambiguous face stimuli in the human ventral visual cortex.

AFFILIATION: Department of Psychology, Princeton University, Princeton, NJ 08544, USA. tmckeeff@princeton.edu

Country: United States

AGENCY: United States NEI

GRANT: R01-EY14202

ACRONYM: EY

MEDLINETA: Cereb Cortex

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