Motter Brad C
Veterans Affairs Medical Center, Syracuse, NY.
Department of Neuroscience and Physiology, State University of New York Upstate Medical University, Syracuse, NY, USA.
J Vis. 2018 Oct 1;18(11):16. doi: 10.1167/18.11.16.
Saccadic momentum refers to the increased probability of making a saccade in a forward direction relative to the previous saccade. During visual search and free viewing conditions saccadic probability falls in a gradient from forward to backward directions. It has been considered to reflect an oculomotor bias for a continuing motor plan. Here we report that a saccadic momentum gradient is observed in nonhuman primate behavior and in the visual responses of cortical area V4 neurons during a conjunction style visual search task. This result suggests that saccadic momentum arises in part from a biased spatial distribution of visual responses to stimuli. The effect is independent of feature-based selective attention and overridden by directed spatial attention. The implications of saccadic momentum for search guidance are much broader and robust than the inhibition-of-return's presumed role in preventing refixation of recent locations.
扫视动量是指相对于前一次扫视，向前扫视的概率增加。在视觉搜索和自由观看条件下，扫视概率从前向后呈梯度下降。它被认为反映了持续运动计划的眼动偏差。在此我们报告，在联合式视觉搜索任务期间，在非人灵长类动物行为以及皮层V4区神经元的视觉反应中观察到了扫视动量梯度。这一结果表明，扫视动量部分源于对刺激的视觉反应的偏向性空间分布。该效应独立于基于特征的选择性注意，并被定向空间注意所覆盖。扫视动量对搜索引导的影响比返回抑制在防止重新注视最近位置方面的假定作用更为广泛和有力。
