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Updated: Dec 27, 2025

Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings
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Experience Transforms Conjunctive Object Representations: Neural Evidence for Unitization After Visual Expertise.

Jackson C Liang1, Jonathan Erez2, Felicia Zhang3

  • 1Department of Psychology, University of Toronto, Toronto, ON M5S 3G3, Canada.

Cerebral Cortex (New York, N.Y. : 1991)
|March 3, 2020
PubMed
Summary
This summary is machine-generated.

Brain learning transforms complex object recognition by strengthening neural representations in the ventral visual stream (VVS). This unitization process makes familiar objects process faster, akin to single features.

Keywords:
conjunctive processingobject representationperceptual learningperirhinal cortexventral visual stream

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Visual Perception

Background:

  • Object recognition relies on processing multiple features.
  • Unitization theory suggests complex objects are processed as single units, but neural mechanisms are unclear.
  • The ventral visual stream (VVS) is crucial for visual processing.

Purpose of the Study:

  • To investigate the neural mechanisms underlying object recognition unitization.
  • To examine how the brain transforms conjunctive representations of object features.
  • To identify the role of the ventral visual stream (VVS) in learning and object processing.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to scan participants before and after visual training.
  • Multivoxel pattern analysis (MVPA) quantified conjunctive coding strength.
  • Multidimensional scaling (MDS) analyzed representational structures.
  • Functional connectivity analysis assessed interactions between brain regions.

Main Results:

  • Conjunctive coding strength in posterior VVS increased after training with novel objects.
  • Representational separation at the feature level occurred in parallel with changes in feature conjunctions.
  • Higher functional connectivity between anterior and posterior VVS was observed for novel compared to trained objects.

Conclusions:

  • The brain utilizes unitization to refine complex object representations through learning.
  • Posterior VVS regions are recruited for processing unitized, feature-like representations.
  • Anterior VVS plays a role in initiating unitization for novel object stimuli.