NEURAL CODING OF VISUAL STIMULI

我们记录了外侧膝状体单个神经元的活动 核，初级视觉皮层（第一皮层阶段的视觉 下颞叶皮层（最后一个皮层阶段）， 研究视觉感知的机制。 当回答是 分析了它们所包含的信息，我们发现， 模式可以被表示为若干（3-6）个同时的， 独立的活动模式。 这些活动模式被分析为 一个时间代码，这个代码被发现包含更多的信息， 这是由反应强度传达的，通常衡量神经元的反应强度， 反应 将神经元概念化为具有多个独立的 活动模式允许我们使用一组 视觉模式来预测那些由其他模式引起的。我们还发现 下颞叶皮层的神经元记录到了猴子 执行延迟的样本匹配任务， 信息区分模式刺激，并反映是否 给定的刺激是样本、匹配或不匹配。 的变化 对于几种刺激的跨条件的神经元响应可用于 预测神经元对其他刺激的反应变化， 条件 下颞叶神经元也携带着关于 当刺激是以下任一种情况时，正在搜索的刺激（即样本） 匹配或不匹配。 使用不同的模型，我们能够展示如何 对所看到的刺激物的反应会被 前一个刺激。 每一个神经元对的成员都记录在 同时在给定皮层视觉区域中使用单个电极， 独立于另一个，即，他们的信息补充说。 这表明 本地处理是通过添加独立的分析， 刺激被观察

We recorded the activity of single neurons in the lateral geniculate nucleus, primary visual cortex (the first cortical stage of visual processing), and inferior temporal cortex (the last cortical stage), to study the mechanisms underlying visual perception. When the responses were analyzed for the information they contained, we found that the response patterns could be represented as the sum of several (3-6) simultaneous, independent patterns of activity. These activity patterns were analyzed as a temporal code, and this code was found to contain more information than that conveyed by the response strength, the usual measure of neuronal response. Conceptualizing the neuron as having several independent activity patterns allowed us to use the responses elicited by one set of visual patterns to predict those elicited by other patterns. We also found that neurons in inferior temporal cortex recorded from while monkeys perform a delayed matching-to-sample task carry stimulus-specific information differentiating the pattern stimuli, and reflecting whether a given stimulus is the sample, the match, or the nonmatch. The change in the neuronal response across conditions for a few stimuli could be used to predict the change in neuronal response to other stimuli across those same conditions. Inferior temporal neurons also carry information about the stimulus being searched for (i.e. the sample) when the stimulus is either the match or nonmatch. Using a different model we were able to show how the responses to the stimulus being viewed were modified by the responses to the preceding stimulus. Each member of a neuronal pair recorded from simultaneously with a single electrode in a given cortical visual area is independent of the other, i.e., their information adds. This suggests that local processing is carried out by adding independent analyses of the stimulus being viewed.