猫后内侧上雪氏区视神经元对运动棒反应的取向和方向特征

ORIENTATIONAL AND DIRECTIONAL CHARACTERISTICS OF NEURONAL RESPONSES TO MOVING BARS IN THE PMLS AREA OF THE CAT

猫后内侧上雪区（ｐｏｓｔｅｒｏｍｅｄｉａｌｌａｔｅｒａｌｓｕｐｒａｓｙｌｖｉａｎａｒｅａ，ＰＭＬＳ）的绝大多数神经元（１７１／２００）对运动棒的取向调谐，６２％（１２４／２００）细胞的取向调谐宽度（半高波宽）小于９０°：按方向选择性和取向选择性可分辨出几类特征明显的细胞类型：１、强取向和强方向选择性细胞；２、强取向调谐的双向选择细胞；３、弱取向调谐的强方向选择细胞；４、无取向无方向选择性细胞；以及５、特征不明显的或中间类型细胞。它们与最近光学记录揭示的鹰猴中颞叶视区（ｍｉｄｄｌｅｔｅｍｐｏｒａｌｖｉｓｕａｌａｒｅａ，ＭＴ）的组织有很好的吻合。

Most posteromedial lateral suprasylvian (PMLS) cells (171/200) tuned to the orientation of moving bars. 65% of their tuning widths (width at half height)were less than90°.Taking into consideration of both orientational and directional selectivities, four distinct cell groups could be recognized. 1. cells with strong direction as well as orientation selectivities; 2. cells with strong orientation tuning and bidirection selectivity;3 cells with weak orientation tuning and strong direction selectivity;4.cells neither orientationally nor directionally tuned; 5. cells without the above distinct characteristics.There types of cells agree well with the organization of the middle temporal visual area (MT) of the owl monley, revealed by using optical recording techniques.