Bauer Roman, Heinze Sabine
FB Physik/Neurophysik, Philipps-Universität, Renthof 7, 35032 Marburg, Germany.
Exp Brain Res. 2002 Nov;147(2):145-52. doi: 10.1007/s00221-002-1178-6. Epub 2002 Oct 1.
Psychophysics has established various rules of contour integration in gestalt perception. We tested the rule of good continuation by stimulating behaving monkeys with simple figures composed of Gabor patches, while recording from upper layer cells in visual cortex (V1). By decomposing these figures into their components and stimulating receptive field centers and surrounds separately with this stimulus set, we tested center-surround interaction for linearity. In pure-fixation tasks, the interaction was negative for the early strong evoked response, i.e., in this phase figural context rather inhibited the cells. However, in the following tonic response phase, a subgroup of neurons showed positive interaction during the whole stimulus presentation period of at least 1,000 ms. Attention to the figure in discrimination tasks only slightly improved this positive interaction between 150 and 300 ms. We interpret these results as selective cooperation and mutual facilitation of cortical V1 cells, thereby supporting the saliency of borders and contours in perception of visual scenes.
心理物理学已经在格式塔感知中确立了各种轮廓整合规则。我们通过用由Gabor斑块组成的简单图形刺激行为中的猴子，同时记录视觉皮层（V1）上层细胞的活动，来测试良好延续性规则。通过将这些图形分解为其组成部分，并用该刺激集分别刺激感受野中心和周边，我们测试了中心-周边相互作用的线性。在纯注视任务中，对于早期强烈的诱发反应，相互作用为负，即在这个阶段，图形背景反而抑制了细胞。然而，在随后的紧张性反应阶段，一组神经元在至少1000毫秒的整个刺激呈现期内表现出正相互作用。在辨别任务中对图形的注意仅在150至300毫秒之间略微改善了这种正相互作用。我们将这些结果解释为皮层V1细胞的选择性合作和相互促进，从而支持视觉场景感知中边界和轮廓的显著性。
