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Related Experiment Videos

The sightless view: neural correlates of occluded objects.

Oliver J Hulme1, S Zeki

  • 1Anatomy Department, Wellcome Department of Imaging Neuroscience, University College London, London WC1E6BT, UK. o.hulme@ucl.ac.uk

Cerebral Cortex (New York, N.Y. : 1991)
|July 18, 2006
PubMed
Summary

Neural activity in object-selective brain regions like the fusiform face area (FFA) may reflect awareness of an object

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • Understanding the neural basis of object perception is crucial.
  • Previous studies used masking and dichoptic presentation to explore this relationship.
  • The role of direct perception versus awareness of presence remains unclear.

Purpose of the Study:

  • To investigate neural activity during object perception when direct perception is dissociated from awareness of presence.
  • To determine if object-selective brain regions respond to direct perception or awareness of an object.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to measure brain activity.
  • Subjects viewed objects (faces and houses) that were occluded by an opaque screen.
  • Brain responses were compared between visible and occluded object conditions.

Main Results:

  • The majority of the fusiform face area (FFA) and lateral occipital cortex showed similar responses whether objects were visible or occluded.
  • A region in the premotor cortex was selectively activated by the occlusion of objects.
  • This suggests that FFA and lateral occipital cortex activity might reflect awareness of presence rather than direct perception.

Conclusions:

  • Activity in object-selective regions may indicate awareness of an object's presence, not its direct perception.
  • The premotor cortex plays a role in processing occluded objects.
  • This finding challenges previous assumptions about neural correlates of object perception.

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