Journal
NEURAL REGENERATION RESEARCH
Volume 16, Issue 9, Pages 1871-1876Publisher
WOLTERS KLUWER MEDKNOW PUBLICATIONS
DOI: 10.4103/1673-5374.303043
Keywords
direction selectivity; electrophysiological recording; marmoset; orientation selectivity; receptive field; second visual area; spatial frequency; speed selectivity; temporal frequency
Categories
Funding
- Monash University
- University of Sichuan
- Australian Research Council [DP0451206]
- National Health and Medical Research Council [384115]
- Australian Research Council [DP0451206] Funding Source: Australian Research Council
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Physiological characteristics of marmoset V2 neurons are similar to V1 neurons, with orientation selectivity and separable spatial/temporal frequency curves playing important roles in visual processing.
The physiological characteristics of the marmoset second visual area (V2) are poorly understood compared with those of the primary visual area (V1). In this study, we observed the physiological response characteristics of V2 neurons in four healthy adult marmosets using intracortical tungsten microelectrodes. We recorded 110 neurons in area V2, with receptive fields located between 8 degrees and 15 degrees eccentricity. Most (88.2%) of these neurons were orientation selective, with half-bandwidths typically ranging between 10 degrees and 30 degrees. A significant proportion of neurons (28.2%) with direction selectivity had a direction index greater than 0.5. The vast majority of V2 neurons had separable spatial frequency and temporal frequency curves and, according to this criterion, they were not speed selective. The basic functional response characteristics of neurons in area V2 resemble those found in area V1. Our findings show that area V2 together with V1 are important in primate visual processing, especially in locating objects in space and in detecting an object's direction of motion.
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