Yang Yin, Chen Ke, Rosa Marcello G P, Yu Hsin-Hao, Kuang Li-Rong, Yang Jie
Department of Ophthalmology, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital; College of Medicine, University of Electronic Science and Technology of China, Chengdu, Sichuan Province, China.
School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, Sichuan Province, China.
Neural Regen Res. 2021 Sep;16(9):1871-1876. doi: 10.4103/1673-5374.303043.
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° and 15° eccentricity. Most (88.2%) of these neurons were orientation selective, with half-bandwidths typically ranging between 10° and 30°. 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. The methods used in this study were approved by the Monash University Animal Ethics Committee, Australia (MARP 2009-2011) in 2009.
与初级视觉区域（V1）相比，狨猴第二视觉区域（V2）的生理特征鲜为人知。在本研究中，我们使用皮层内钨微电极观察了4只健康成年狨猴V2神经元的生理反应特征。我们在V2区域记录了110个神经元，其感受野位于离中心8°至15°的范围内。这些神经元中的大多数（88.2%）具有方向选择性，半高宽通常在10°至30°之间。相当一部分具有方向选择性的神经元（28.2%）的方向指数大于0.5。绝大多数V2神经元具有可分离的空间频率和时间频率曲线，根据这一标准，它们不具有速度选择性。V2区域神经元的基本功能反应特征与V1区域的相似。我们的研究结果表明，V2区域和V1区域在灵长类动物视觉处理中很重要，特别是在空间中定位物体和检测物体的运动方向方面。本研究中使用的方法于2009年获得澳大利亚莫纳什大学动物伦理委员会（MARP 2009 - 2011）的批准。
