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Updated: Jan 26, 2026

Perceptual and Category Processing of the Uncanny Valley Hypothesis' Dimension of Human Likeness: Some Methodological Issues
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Category-selective areas in human visual cortex exhibit preferences for stimulus depth.

Samoni Nag1, Daniel Berman2, Julie D Golomb2

  • 1Department of Psychology, Center for Cognitive & Brain Sciences, The Ohio State University, USA; Department of Psychology, The George Washington University, USA.

Neuroimage
|April 13, 2019
PubMed
Summary

Brain regions for recognizing objects also process depth. Visual areas like OFA, LOC, MT+, PPA, and OPA show distinct depth preferences, regardless of object category, revealing depth processing is linked to object recognition.

Keywords:
3D visual perceptionCategory-selective visual regionsDepth perceptionOccipital place area (OPA)Scene perceptionfMRI

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Visual Perception

Background:

  • The human brain uses specialized regions for object recognition.
  • Understanding spatial location, including depth, is crucial for visual processing.
  • Previous research explored 2D spatial preferences in object-selective regions, but depth sensitivity remained unexamined.

Purpose of the Study:

  • To investigate how object category-selective brain regions respond to visual stimuli presented at different depths.
  • To determine if depth preferences in these regions are independent of the stimulus category.

Main Methods:

  • Functional MRI (fMRI) experiment with subjects viewing category-specific (faces, objects, scenes) and unspecific stimuli.
  • Stimuli presented at varying depth planes (front, middle, back) using red/green anaglyph glasses.
  • Two experiments: one with single depth planes, another with mixed (simultaneous front and back) depths.

Main Results:

  • Occipital face area (OFA) and lateral occipital complex (LOC) preferred front depths.
  • Motion area MT+ showed a linear preference: front > middle > back.
  • Scene-selective regions (PPA, OPA) preferred front and/or back depths over middle.
  • Occipital place area (OPA) showed a strong preference for mixed depth stimuli.

Conclusions:

  • Object category-selective brain regions demonstrate depth preferences.
  • These depth preferences are largely independent of the semantic category of the viewed stimulus.
  • Visual areas involved in object recognition may also play a role in processing depth information, orthogonal to category processing.