van Opstal A J, van Gisbergen J A
Department of Medical Physics and Biophysics, Nijmegen, The Netherlands.
Exp Brain Res. 1990;79(1):143-9. doi: 10.1007/BF00228883.
We have investigated the involvement of collicular movement cells in the monkey in the execution of averaging saccades, elicited by a visual double-step stimulus. We found that, qualitatively, most (12/14) movement cells were recruited during averaging saccades in roughly the same way as for comparable visually-elicited saccades to single targets (V-saccades). However, movement-cell responses during averaging saccades in trials where the target suddenly changed direction were often less intense than for a comparable V-saccade. In these cases, the averaging responses were observed to be also slower than V-saccades of the same amplitude. Firing rate and double-step saccade dynamics were found to be significantly correlated in 9/14 cells tested. Several hypotheses for the collicular role in the generation of averaging saccades are discussed.
我们研究了猴的视丘运动细胞在执行由视觉双步刺激引发的平均扫视中的作用。我们发现，定性地说，大多数（12/14）运动细胞在平均扫视过程中的募集方式与对单个目标的类似视觉诱发扫视（V扫视）大致相同。然而，在目标突然改变方向的试验中，平均扫视期间运动细胞的反应通常比对可比的V扫视反应强度要弱。在这些情况下，观察到平均反应也比相同幅度的V扫视慢。在所测试的14个细胞中有9个细胞的放电率与双步扫视动力学显著相关。文中讨论了关于视丘在平均扫视产生中作用的几种假说。
