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Updated: Aug 2, 2026

Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings
Published on: August 1, 2018
A human extrastriate area functionally homologous to macaque V4.
J L Gallant1, R E Shoup, J A Mazer
1Department of Psychology, University of California, Berkeley 94720, USA. gallant@socrates.berkeley.edu
A patient with a ventral V4 (V4v) lesion shows deficits in hue perception, intermediate form vision, and visual attention. This supports the role of human V4v in complex visual processing and attention, similar to macaque V4.
Area of Science:
- Neuroscience
- Visual Perception
- Cognitive Neuroscience
Background:
- Extrastriate area V4 is vital for intermediate form vision and visual attention in primates.
- Human neuroimaging suggests a ventral V4 (V4v) area in the lingual/fusiform gyrus.
Observation:
- A neurological patient (AR) with a putative V4v lesion was studied.
- The lesion spared early visual processing (luminance, orientation, motion).
Findings:
- The patient exhibited impaired hue perception, intermediate form vision, and visual attention in the upper contralateral visual field.
- Deficits included difficulties with illusory borders, Glass patterns, curvature, non-Cartesian patterns, object part discrimination, low-salience target detection, and orientation discrimination with distractors.
Implications:
- The observed deficits align with the known functions of primate V4.
- This suggests AR's lesioned area is functionally homologous to macaque V4, implicating human V4v in complex visual processing and attention.
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