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首页> 外文期刊>Journal of Neurophysiology >Response to motion in extrastriate area MSTl: center-surround interactions.
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Response to motion in extrastriate area MSTl: center-surround interactions.

机译：对超净区域MST1中运动的响应：中心-周围相互作用。

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The medial superior temporal area of the macaque monkey extrastriate visual cortex can be divided into a dorsal medial (MSTd) and a lateral ventral (MSTl) region. The functions of the two regions may not be identical: MSTd may process optic flow information that results from the movement of the observer, whereas MSTl may be related more closely to processing visual motion related specifically to the motion of objects. If MSTl were related to such object motion, one would expect to see mechanisms for the segregation of objects from their surround. We investigated one of these mechanisms in MSTl neurons: the effect of stimuli falling in the region surrounding the receptive field center on the response to stimuli falling in the field center. We found the effects of the surround stimulation to be modulatory with little response to the surround stimulus itself but a clear effect on the response to the stimulus falling on the receptive field center. The response to motion in the center in the direction preferred for the neuron usually increased when the surround motion was in the opposite direction to that in the center and decreased when surround motion was in the same direction as that in the center. Fifty-seven percent of the neurons showed a ratio of response for center motion with a surround moving in the opposite direction to that in the center for center motion alone that was >1. The response to motion in the center also increased when the surround stimulus was stationary, and this increase was sometimes larger than that with a moving surround. Nearly 70% of the neurons showed a ratio of response to center motion with a stationary surround to center motion alone that was >1. This is in contrast to the minimal effect of stationary surrounds in middle temporal area neurons. When the stimulus presentation was reversed so that the stimulus in the center was stationary and the surround moved, some MSTl neurons responded when the direction of motion in the surround was in the direction opposite to the preferred direction of motion in the center of the receptive field. Stimulation of the surround thus had a profound effect on the response of MSTl neurons, and this pronounced effect of the surround is consistent with a role in the segmentation of objects using motion.
机译：猕猴外条纹视觉皮层的内侧上颞区可分为背内侧（MSTd）和外侧腹侧（MST1）区。两个区域的功能可能不相同：MSTd可能处理由观察者的运动产生的光流信息，而MST1可能与处理与对象运动有关的视觉运动更紧密相关。如果MST1与这种物体运动有关，则人们将期望看到将物体从其周围分离的机制。我们研究了MST1神经元中的这些机制之一：落在感受野中心周围区域的刺激对落在野外中心的刺激的响应的影响。我们发现周围刺激的作用是调节性的，对周围刺激本身的反应很小，但是对对落在感受野中心的刺激反应的影响却很明显。当周围运动与中心的方向相反时，通常在中央方向上对神经元的运动响应增加，而当周围运动与中心的方向相同时，响应则下降。 57％的神经元显示出对中心运动的响应比率，其中环绕运动的方向与中心运动相反，仅中心运动的响应方向> 1。当周围刺激静止时，对中央运动的响应也增加了，有时这种增加比周围运动的情况要大。近70％的神经元显示出对中心运动的响应比率，其中静止的周围相对于中心运动的比率> 1。这与在颞中部神经元中固定周围的最小影响相反。当刺激呈现反转使得中心的刺激静止并且周围运动时，当周围运动的方向与在接收场中心的优选运动方向相反时，一些MST1神经元做出响应。因此，对周围环境的刺激对MST1神经元的反应具有深远的影响，并且周围环境的这种明显作用与使用运动分割对象中的作用是一致的。

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