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Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
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Updated: Dec 24, 2025

Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings
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Searching for object pointers in the visual cortex.

Shude D Zhu1, Li Alex Zhang1, Rüdiger von der Heydt1,2

  • 1Zanvyl Krieger Mind/Brain Institute, Johns Hopkins University, Baltimore, Maryland.

Journal of Neurophysiology
|April 16, 2020
PubMed
Summary
This summary is machine-generated.

Object permanence is maintained by neural pointers, even during visual occlusion. Monkey V4 neurons show elevated activity for occluded objects, supporting this pointer theory, though further research is needed.

Keywords:
area V4object permanenceremappingvisual cortexvisual organization

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Cognitive Science

Background:

  • Object perception relies on stable representations, yet visual cortex activity is transient and eye-position dependent.
  • A hypothesis suggests object pointers provide continuity, sending persistent facilitatory signals to feature cells.

Purpose of the Study:

  • To investigate the existence and properties of object pointers in the monkey visual cortex (V2 and V4).
  • To test if neural signals persist for occluded objects and remap during eye movements.

Main Methods:

  • Developed a novel paradigm with a monkey freely inspecting objects, some of which were temporarily occluded by drifting strips.
  • Recorded neural activity in areas V2 and V4 while manipulating object visibility and attention.

Main Results:

  • Monkey eye movements demonstrated robust tracking of occluded object locations and types.
  • V4 neurons, unlike V2, showed elevated activity for occluded objects compared to a blank condition.
  • This elevated activity was reduced for previously fixated objects ('inhibition of return').
  • Visible attended objects showed enhanced V4 responses, but occluded objects did not modulate responses when attended or saccade targets.

Conclusions:

  • Results 1-3 partially support the object pointer hypothesis, indicating neural signals for occluded objects.
  • The lack of modulation for occluded objects under attention or saccade targets presents an inconsistency requiring further investigation.