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Neurons with large bilateral receptive fields in monkey prelunate gyrus
I N Pigarev1, H C Nothdurft, S Kastner
1Max Planck Institute for Biophysical Chemistry, AG Neurobiology, Göttingen, Germany.
Experimental Brain Research
|February 24, 2001
Summary
Neurons in the V4 visual area of monkeys have surprisingly large receptive fields (RFs) that cover both visual fields. These cells, found in the periphery of V4, show symmetrical responses and maintain consistent feature preferences across their extensive RFs.
Area of Science:
- Neuroscience
- Visual Neuroscience
Background:
- The prelunate gyrus, specifically area V4, is crucial for visual processing.
- Previous studies on V4 neurons typically describe smaller, unilateral receptive fields.
Purpose of the Study:
- To investigate the properties of neurons in the dorsocaudal part of the prelunate gyrus.
- To characterize the receptive field (RF) sizes and properties of neurons in this V4 region.
Main Methods:
- Single-cell recordings were performed in alert Macaca fascicularis monkeys.
- Receptive fields of individual neurons were mapped and analyzed.
Main Results:
- A subset of neurons (n=82) exhibited unusually large, bilateral receptive fields extending into both visual hemifields.
- These neurons were located in the periphery of area V4 and spared the fovea.
- Many bilateral RFs displayed two symmetrical foci of maximal responsiveness and maintained consistent orientation, color, and motion preferences.
Conclusions:
- The V4 area contains neurons with large bilateral receptive fields, challenging previous assumptions about V4 functional organization.
- These findings suggest a more complex role for V4 in integrating visual information across hemifields than previously understood.