Motter B C, Holsapple J
Research Service 151, Veterans Affairs Medical Center, and Department of Neuroscience & Physiology, SUNY-Upstate Medical University, Syracuse, NY 13210, USA.
Vision Res. 2007 May;47(10):1261-81. doi: 10.1016/j.visres.2007.02.006. Epub 2007 Apr 5.
Target detection during active visual search was examined. The chance corrected spatial distribution of target detection was found to be symmetrically distributed around the point of fixation and, unexpectedly, was independent of the proximity of fixations to the display boundaries. Memory was found to play a very limited role in target detection, but a significant role in the guidance of eye movements. A model of covert shifts was used to estimate the number and spatial distribution of shifts required to explain observed performance. An increase from one to five shifts per fixation across increasing array set size as estimated by two different methods was inconsistent with unchanging fixation durations, suggesting that multiple covert shifts are not occurring during the fixations in active search.
研究了主动视觉搜索过程中的目标检测。发现目标检测的机遇校正空间分布围绕注视点呈对称分布，并且出乎意料的是，它与注视点到显示边界的距离无关。研究发现记忆在目标检测中作用非常有限，但在眼动引导中起重要作用。使用了一个隐蔽转移模型来估计解释观察到的表现所需的转移数量和空间分布。通过两种不同方法估计，随着阵列集大小增加，每次注视的转移次数从一次增加到五次，这与固定注视持续时间不一致，表明在主动搜索的注视过程中不会发生多次隐蔽转移。
