Duysens J, Schaafsma S J, Orban G A
Department of Medical Physics & Biophysics, K.U.N., Nijmegen, The Netherlands.
Vision Res. 1996 Oct;36(20):3243-51. doi: 10.1016/0042-6989(96)00040-5.
To answer the question whether OFF response amplitude (firing rate) of visual cortical cells varies as a function of stimulus duration, a series of such cells from areas 17 and 18 of the cat were investigated with a stationary light bar, presented for different durations (10-3200 msec) over the receptive field. Out of a sample of 174 cells tested, 58 cells were found for which the OFF responses varied as a function of ON stimulus duration. Of these cells, 29 showed a continuous increase up to the longest duration tested, six showed a sharp tuning for medium range durations (between 50 and 400 msec) and the remaining 23 cells had an intermediate profile (increase to optimum followed by slight decrease). For some of these cells this tuning could be used to predict adequately the velocity tuning. Similar recordings in 13 lateral geniculate nucleus cells failed to show duration tuning.
为了回答视觉皮层细胞的撤光反应幅度（放电频率）是否随刺激持续时间而变化这一问题，使用一个固定的光条对猫的17区和18区的一系列此类细胞进行了研究，该光条在感受野上呈现不同的持续时间（10 - 3200毫秒）。在测试的174个细胞样本中，发现有58个细胞的撤光反应随开刺激持续时间而变化。在这些细胞中，29个细胞的反应在测试的最长持续时间之前持续增加，6个细胞对中等范围持续时间（50至400毫秒之间）表现出尖锐的调谐，其余23个细胞具有中间型特征（增加至最佳值后略有下降）。对于其中一些细胞，这种调谐可用于充分预测速度调谐。在13个外侧膝状体核细胞中进行的类似记录未显示持续时间调谐。
