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Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings
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Large-scale functional overlap between dorsal and ventral object-responsive networks.

Claire Simmons1,2, Marlene Behrmann1,3, Vladislav Ayzenberg4

  • 1Department of Psychology and Neuroscience Institute, Carnegie Mellon University, Pittsburgh, PA, USA.

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The dorsal and ventral visual pathways, crucial for object recognition and action, form highly interconnected brain networks. These networks show significant overlap within individuals, highlighting integrated visual processing.

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Dorsal parietal cortexFunctional connectivityHigher-order visual areasObject recognitionRRID:_023356Ventral temporal cortex

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Visual Perception

Background:

  • Object recognition is linked to the ventral visual pathway, while action is linked to the dorsal visual pathway.
  • While interactions between these pathways are known, their whole-brain network connectivity requires further investigation.

Purpose of the Study:

  • To characterize the whole-brain network connections of object-selective regions within the dorsal and ventral visual pathways.
  • To evaluate the extent and strength of network connectivity between these pathways during object viewing.

Main Methods:

  • Utilized functional MRI (fMRI) data from two experiments where participants viewed objects.
  • Employed multiple analytical approaches to map whole-brain network connections from seed regions in both pathways.
  • Analyzed connectivity patterns for tools and non-tools, controlling for shared variance between pathways.

Main Results:

  • Revealed substantial spatial overlap in connectivity networks generated from dorsal and ventral pathway seeds.
  • Observed greater similarity of these object networks within individuals compared to across individuals.
  • Found that the dorsal pathway exhibited stronger, more widespread connectivity and was a greater source of effective connectivity.

Conclusions:

  • Dorsal and ventral visual pathways form highly overlapping and distributed networks for object perception.
  • The findings suggest a more integrated system for object recognition and action than previously understood.
  • The dorsal pathway plays a significant role in driving network connectivity for object-related processing.