A rapid and precise on-response in posterior parietal cortex
A rapid and precise on-response in posterior parietal cortex
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DOI：
10.1523/jneurosci.5007-03.2004
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发表时间：
2004-02-25
影响因子：
5.3
通讯作者：
Goldberg, ME
中科院分区：
文献类型：
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作者：
Bisley, JW;Krishna, BS;Goldberg, ME
猴子外侧顶内区（LIP）神经元的活动预测了猴子的空间注意分配。我们在这里表明，尽管在视觉层次中相对较高，但LIP中的神经元具有极短且精确的视觉延迟。平均潜伏期为45.2毫秒;发作反应的时间精度通常优于4毫秒。大多数神经元在最初的爆发后有一个暂停的反应，然后是更持续的视觉活动。先前的注意力分配对初始爆发的潜伏期或幅度没有影响，但对后来持续活动的幅度产生了明显的影响。总之，这些数据表明LIP视觉反应的初始爆发反映了未受污染的感觉信号。关于刺激开始的信息通过视觉系统迅速传递到LIP;响应具有比以前实现的更高的速度和时间精度。这些信息可以用于快速可靠地将注意力定向到视觉环境中的新物体。
The activity of neurons in the lateral intraparietal area ( LIP) of the monkey predicts the monkey's allocation of spatial attention. We show here that despite being relatively high within the visual hierarchy, neurons in LIP have extremely short and precise visual latencies. Mean latency was 45.2 msec; the timing precision of the onset response was usually better than 4 msec. The majority of neurons had a pause in response after an initial burst, followed by more sustained visual activity. Previous attention allocation had no effect on either the latency or magnitude of the initial burst, but produced clear effects on the magnitude of the later sustained activity. Together, these data indicate that the initial burst in LIP visual response reflects an uncontaminated sensory signal. Information about stimulus onset is transmitted rapidly through the visual system to LIP; the on-response has a higher speed and temporal precision than realized previously. This information could be used to orient attention to novel objects in the visual environment rapidly and reliably.