Similar electrophysiological correlates of texture segregation induced by luminance, orientation, motion and stereo
Similar electrophysiological correlates of texture segregation induced by luminance, orientation, motion and stereo
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DOI：
10.1016/s0042-6989(96)00322-7
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发表时间：
1997-06-01
期刊：
影响因子：
1.8
通讯作者：
Meigen, T
中科院分区：
文献类型：
--
作者：
Bach, M;Meigen, T
某些局部特征会引起预先注意的纹理分离。最近，与前注意纹理分离（tsVEPs）相关的视觉诱发电位（VEP）中的成分已被证明。为了评估跨视觉维度的视觉处理的相似性和相异性，我们比较了VEP和tsVEP在纹理分离中的亮度，方向，运动和立体视差。我们发现，与“低水平”VEP相比，这四个视觉维度上的tsVEP非常相似。tsVEP始终为负值;其隐式时间、峰值潜伏期和振幅（单位：msec/msec/mu V）为：亮度91/234/-5.7;方向84/257/-3.9;运动80/295/-8.3;立体声95/310/-5.0。交叉相关函数作为相似性的定量测量，与低水平VEP相比，tsVEP的平均值高4.2倍（P < 0.0001）。结果表明：（1）tsVEP代表了在一定程度上跨视觉维度泛化的神经机制的活动;（2）这些假设的泛化机制可能已经存在于初级视觉皮层中。(C)1997 Elsevier Science Ltd.
Certain local features induce preattentive texture segregation. Recently, components in the visual evoked potential (VEP) associated with preattentive texture segregation (tsVEPs) have been demonstrated. To assess the similarity and dissimilarity of visual processing across visual dimensions, we compared VEPs and tsVEPs in texture segregation by luminance, orientation, motion and stereo disparity. We found tsVEPs across these four visual dimensions to be remarkably similar when compared to the ''low-level'' VEPs, The tsVEPs were always negative; their implicit time, peak latency and amplitude were (in msec/msec/mu V): 91/234/-5.7, luminance; 84/257/-3.9, orientation; 80/295/-8.3, motion; and 95/310/-5.0 for stereo. The cross-correlation function, as a quantitative measure for similarity, on average was higher for the tsVEPs by a factor of 4.2 as compared to the low-level VEPs (P < 0.0001). The results suggest (1) that the tsVEPs represent activity of neural mechanisms that have generalised to some degree across visual dimensions; and (2) that these hypothetical generalisation mechanisms might exist already in the primary visual cortex. (C) 1997 Elsevier Science Ltd.