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Related Experiment Videos

Position selectivity in scene- and object-responsive occipitotemporal regions.

Sean P MacEvoy1, Russell A Epstein

  • 1Department of Psychology, Center for Cognitive Neuroscience, University of Pennsylvania, Philadelphia, PA 19104, USA. macevoy@psych.upenn.edu

Journal of Neurophysiology
|July 27, 2007
PubMed
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Scene-selective brain regions like the parahippocampal place area (PPA) show position-invariant adaptation, suggesting their neuronal receptive fields (RFs) span the vertical meridian for stable visual scene perception.

Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Visual Perception

Background:

  • Complex visual scenes activate specific brain regions: parahippocampal place area (PPA), retrosplenial complex (RSC), and transverse occipital sulcus (TOS).
  • Understanding neuronal sensitivity to stimulus retinal position in these areas is crucial for scene perception and navigation.

Purpose of the Study:

  • To investigate the retinal position sensitivity of neuronal receptive fields (RFs) in scene-selective brain regions (PPA, RSC, TOS).
  • To compare RF properties between scene-selective and object-selective brain areas.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to measure neural responses.
  • Stimuli (scenes and objects) were presented in either the left or right visual hemifields.

Related Experiment Videos

  • Adaptation levels were measured for stimuli repeated in the same or opposite hemifields.

    • Main Results:

    • Scene-selective regions (PPA, RSC, TOS) showed position-invariant adaptation, meaning adaptation magnitude was independent of hemifield repetition.
    • Object-selective regions exhibited greater adaptation when objects were repeated in the same hemifield.
    • Neuronal RFs in scene-selective regions appear to span the vertical meridian, unlike those in object-selective regions.

    Conclusions:

    • Scene-selective regions (PPA, RSC, TOS) possess neuronal receptive fields that span the vertical meridian.
    • This position invariance supports stable representations of large-scale environmental features, crucial for scene perception and navigation.
    • These findings differentiate scene and object processing mechanisms in the human brain.