Supèr Hans
ICREA & Department Basic Psychology, Faculty of Psychology, University of Barcelona (UB), Pg. Vall d'Hebron 171, 08035 Barcelona, Spain.
J Physiol Paris. 2006 Jul-Sep;100(1-3):63-9. doi: 10.1016/j.jphysparis.2006.09.002. Epub 2006 Oct 27.
Every day we shift our gaze about 150.000 times mostly without noticing it. The direction of these gaze shifts are not random but directed by sensory information and internal factors. After each movement the eyes hold still for a brief moment so that visual information at the center of our gaze can be processed in detail. This means that visual information at the saccade target location is sufficient to accurately guide the gaze shift but yet is not sufficiently processed to be fully perceived. In this paper I will discuss the possible role of activity in the primary visual cortex (V1), in particular figure-ground activity, in oculo-motor behavior. Figure-ground activity occurs during the late response period of V1 neurons and correlates with perception. The strength of figure-ground responses predicts the direction and moment of saccadic eye movements. The superior colliculus, a gaze control center that integrates visual and motor signals, receives direct anatomical connections from V1. These projections may convey the perceptual information that is required for appropriate gaze shifts. In conclusion, figure-ground activity in V1 may act as an intermediate component linking visual and motor signals.
我们每天会转移目光约15万次，大多时候都没有注意到。这些目光转移的方向并非随机，而是由感官信息和内部因素引导。每次移动后，眼睛会短暂静止，以便能够详细处理我们注视中心的视觉信息。这意味着扫视目标位置的视觉信息足以准确引导目光转移，但尚未得到充分处理以被完全感知。在本文中，我将讨论初级视觉皮层（V1）中的活动，特别是图形-背景活动，在眼球运动行为中可能发挥的作用。图形-背景活动发生在V1神经元的晚期反应期，与感知相关。图形-背景反应的强度预测眼球扫视运动的方向和时刻。上丘是一个整合视觉和运动信号的注视控制中心，它直接从V1接收解剖学连接。这些投射可能传递适当的目光转移所需的感知信息。总之，V1中的图形-背景活动可能作为连接视觉和运动信号的中间成分发挥作用。
