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Decoding individual natural scene representations during perception and imagery.

Matthew R Johnson1, Marcia K Johnson2

  • 1Department of Psychology, Yale University New Haven, CT, USA.

Frontiers in Human Neuroscience
|February 28, 2014
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Summary
This summary is machine-generated.

Item-specific scene information is encoded in multiple visual brain areas during perception and mental imagery. This information is re-instantiated during visualization, supporting models of mental representation.

Keywords:
MVPAPPAclassificationdecodingfMRIscenevisual imageryvisual perception

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Area of Science:

  • Cognitive Neuroscience
  • Neuroimaging
  • Visual Perception

Background:

  • Understanding how the brain represents complex visual information, like natural scenes, is crucial.
  • Previous research has explored neural representations of visual stimuli, but item-specific scene information during mental imagery remains less understood.

Purpose of the Study:

  • To investigate the extent of item-specific information representation for natural scenes in human extrastriate visual cortex.
  • To determine if this information is present during both visual perception and visual mental imagery.
  • To examine the role of scene-selective brain regions and the fusiform face area (FFA) in representing visual scenes.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) data acquisition from participants viewing or visualizing natural scenes.
  • Multi-voxel pattern analysis (MVPA) using a support vector machine (SVM) classifier to decode item-specific information.
  • Analysis focused on category-selective visual cortex areas, including OPA, PPA, RSC, PCu/IPS, and FFA.

Main Results:

  • Item-specific scene information was successfully decoded from multiple scene-selective areas (OPA, PPA, RSC, PCu/IPS) during both perception and mental imagery.
  • Perceived scene information was re-instantiated during mental imagery of the same scenes.
  • The fusiform face area (FFA) contained item-specific scene information during perception but not during mental imagery.

Conclusions:

  • High-level visual cortex areas, particularly scene-selective regions, robustly represent item-specific information of complex natural scenes during both perception and mental imagery.
  • The re-instantiation of perceptual information during mental imagery supports models of reflective mental processes.
  • FFA's role in scene representation appears limited to perception, not mental imagery, suggesting it's not essential for visual scene mental representations.