Using single and multiunit recordings in the striate cortex of alert macaque monkeys, we find that gamma-band (20-70 Hz) oscillations in neuronal firing are a prominent feature of V1 neuronal activity. The properties of this rhythmic activity are very similar to those previously observed in the cat. Gamma-band activity is strongly dependent on visual stimulation, largely absent during spontaneous activity and, under the conditions of our experiment, not time-locked to the vertical refresh of the computer monitor (80 Hz) used to present the stimuli. In our sample, 61% of multiunit activity (MUA) and 46% of single-unit activity (SUA) was significantly oscillatory, with mean frequencies of 48+/-9 and 42+/-13 Hz, respectively. Gamma-band activity was most likely to occur when cells were activated by their optimal stimuli, but still occurred, although less often and with lower amplitude, in response to nonoptimal stimuli. The frequency of gamma-band activity also reflected stimulus properties, with drifting gratings evoking higher-frequency oscillations than stationary gratings. As in the cat, the spike trains of single cells showing gamma-band oscillations often displayed a pattern of repetitive burst firing, with intraburst firing rates of 300-800 Hz. The overall similarity of rhythmic neuronal activity in the primary visual cortex of cats and monkeys suggests that the phenomenon is not species-specific. The stimulus-dependence of the rhythmic activity is consistent with a functional role in visual perception.

译文

使用警报猕猴的纹状皮层中的单个和多单位记录,我们发现神经元放电中的伽玛带 (20-70Hz) 振荡是V1神经元活动的突出特征。这种节律活动的特性与以前在猫中观察到的非常相似。伽玛带活动在很大程度上取决于视觉刺激,在自发活动期间基本上不存在,并且在我们的实验条件下,与用于呈现刺激的计算机监视器 (80Hz) 的垂直刷新没有时间锁定。在我们的样本中,多单位活性61% (MUA) 和单单位活性46% (SUA) 显着振荡,平均频率分别为48/-9和42/-13Hz。当细胞被其最佳刺激激活时,最有可能发生 γ 带活性,但仍然发生,尽管频率较低且幅度较低,但响应于非最佳刺激。伽马带活动的频率也反映了刺激特性,漂移光栅比固定光栅引起更高频率的振荡。与cat一样,显示伽马带振荡的单个细胞的尖峰序列通常显示出重复爆发的模式,其内部发射速率为300-800Hz。猫和猴子初级视觉皮层中节律性神经元活动的总体相似性表明该现象不是特定于物种的。节律活动的刺激依赖性与视觉感知中的功能作用一致。

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