Davis Elizabeth T, Shikano Terry, Main Keith, Hailston Ken, Michel Rachel K, Sathian K
School of Psychology, Georgia Institute of Technology, Atlanta, 30332-0170, USA.
Vision Res. 2006 Apr;46(8-9):1263-81. doi: 10.1016/j.visres.2005.10.032.
Visual search may be affected by mirror-image symmetry between target and non-targets and also by switching the roles of target and non-target. Do different attention mechanisms underlie these two phenomena? Can a unifying explanation account for both? We conducted two experiments to decompose processing into component parts, and compared results to competing models' predictions. Mirror-image search was unimpaired after target discrimination had been balanced across search conditions-results were consistent with an unlimited-capacity, decision noise model. Search asymmetry affected higher-level processing, however, resulting in capacity limitations that necessitated serial processing. A unifying explanation can account for these two seemingly unrelated phenomena.
视觉搜索可能会受到目标与非目标之间镜像对称的影响，也会受到目标与非目标角色转换的影响。这两种现象是否基于不同的注意机制？能否用一个统一的解释来解释这两种现象？我们进行了两项实验，将加工过程分解为各个组成部分，并将结果与竞争模型的预测进行比较。在跨搜索条件平衡目标辨别之后，镜像搜索未受损害——结果与无限容量的决策噪声模型一致。然而，搜索不对称影响了更高层次的加工，导致容量限制，从而需要串行加工。一个统一的解释可以说明这两种看似不相关的现象。
