Howard Hughes Medical Institute, University of California, San Francisco, San Francisco, California 94143-0444, USA.
J Neurosci. 2012 Jul 11;32(28):9745-54. doi: 10.1523/JNEUROSCI.0269-12.2012.
The lateral intraparietal area (LIP) has been implicated as a salience map for control of saccadic eye movements and visual attention. Here, we report evidence to link the encoding of saccades and saliency in LIP to modulation of several other sensory-motor behaviors in monkeys. In many LIP neurons, there was a significant trial-by-trial correlation between the firing rate just before a saccade and the postsaccadic or presaccadic pursuit eye velocity. Some neurons also showed trail-by-trial correlations of the firing rate of LIP neurons with the speed of "glissades" that occur at the end of saccades to stationary targets. LIP-pursuit correlations were spatially specific and were strong only when the target appeared in the receptive/movement field of the neuron under study. We suggest that LIP is a component of a salience representation that modulates the strength of visual-motor transmission for pursuit, and that may play a similar role for many movements, beyond its traditional roles in guiding saccadic eye movements and localizing attention.
顶内旁区(LIP)已被认为是眼球运动和视觉注意控制的突显图。在这里,我们报告了将 LIP 中的扫视和突显编码与猴子的几种其他感觉运动行为的调制联系起来的证据。在许多 LIP 神经元中,在扫视之前的发射率与扫视后的或扫视前的追踪眼速度之间存在显著的逐次试验相关性。一些神经元还显示 LIP 神经元的发射率与扫视结束时发生在静止目标上的“滑行”速度之间的逐次试验相关性。LIP-追踪相关性具有空间特异性,并且仅当目标出现在正在研究的神经元的感受野/运动场内时才很强。我们认为,LIP 是突显表示的一个组成部分,该表示调制了用于追踪的视觉运动传递的强度,并且可能在引导眼球运动和定位注意力之外,对于许多运动也具有类似的作用。