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Related Experiment Video

Updated: Sep 3, 2025

Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings
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View Normalization of Object Size in the Right Parietal Cortex.

Sylvia Hoba1, Gereon R Fink1,2, Hang Zeng3

  • 1Institute of Neuroscience and Medicine, INM-3, Research Center Jülich, 52425 Jülich, Germany.

Vision (Basel, Switzerland)
|July 27, 2022
PubMed
Summary
This summary is machine-generated.

Prior knowledge influences perception, affecting how we see object sizes. The right intraparietal sulcus (IPS) activates when visual object size mismatches familiar size, suggesting it normalizes object views.

Keywords:
fMRIfamiliar sizeright IPSvisual perception

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Area of Science:

  • Cognitive Neuroscience
  • Visual Perception
  • Neuroimaging

Background:

  • Prior knowledge, such as familiar object size, influences early visual processing.
  • Perceptual judgments, like estimating display size, are modulated by stored object representations.

Purpose of the Study:

  • To investigate the neural mechanisms underlying the resolution of conflicts between familiar and perceived object sizes.
  • To determine the role of the right intraparietal sulcus (IPS) in processing size discrepancies.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used in 33 healthy subjects.
  • Participants performed a localization task with objects displayed in sizes congruent or incongruent with their familiar size.
  • A parametric design assessed the relationship between size mismatch and brain activation.

Main Results:

  • Incongruent object displays led to increased activation in the right intraparietal sulcus (IPS) compared to congruent displays.
  • Increased mismatch between displayed and familiar object size correlated with heightened right IPS activation.
  • These findings extend previous patient studies on parietal cortex involvement in object representation matching.

Conclusions:

  • The right IPS plays a crucial role in normalizing visual object information.
  • The right IPS appears to resolve discrepancies between an object's stored prototypical size and its current viewing size.
  • This suggests the right IPS is involved in view normalization for object perception.