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Large-scale dissociations between views of objects, scenes, and reachable-scale environments in visual cortex.

Emilie L Josephs1, Talia Konkle2

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Researchers identified distinct brain regions for processing reachable spaces, separate from navigable scenes and isolated objects. This finding reveals how the brain represents intermediate-scale environments containing multiple items.

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Area of Science:

  • Cognitive Neuroscience
  • Visual Perception
  • Neuroimaging

Background:

  • Brain processing of space and objects involves distinct neural networks.
  • Previous research contrasted navigable scenes with close-up objects, overlooking intermediate environments.
  • Naturalistic vision includes reachable-scale spaces (e.g., tabletops) with multiple objects.

Purpose of the Study:

  • To investigate how the brain represents reachable-scale visual environments.
  • To determine if reachable views are represented distinctly from navigable scenes and isolated objects.
  • To identify specific brain regions involved in processing these intermediate-scale views.

Main Methods:

  • Three functional neuroimaging experiments were conducted on human participants.
  • Participants viewed images of navigable scenes, isolated objects, and reachable-scale environments.
  • Brain activity was analyzed to identify regions with preferential responses to different visual stimuli.

Main Results:

  • A large-scale dissociation was observed between reachable-scale views and both navigable scenes and close-up objects.
  • Three brain regions (posterior collateral sulcus, inferior parietal sulcus, superior parietal lobule) showed preference for reachable views.
  • Reachable views exhibited intermediate response magnitudes in classic scene and object processing areas, dissociating from both categories.

Conclusions:

  • Reachable-scale environments possess a distinct neural representation in the visual cortex.
  • The identified brain regions are specifically involved in processing these intermediate-scale, multi-object environments.
  • These findings advance our understanding of how the brain categorizes and represents complex visual scenes at different scales.