Schweitzer L R
Department of Psychiatry and Behavioral Sciences, University of Texas Medical Branch, Galveston 77550-2774.
Percept Mot Skills. 1991 Aug;73(1):147-61. doi: 10.2466/pms.1991.73.1.147.
Binary-choice paradigms are classificatory problems of basic importance to the understanding of elementary decision processes. Generally when subjects decide if two visual stimuli are identical or differ by as little as one element, the decision of "Different" takes longer. This finding is unexpected as decisions of "Different" should not require an exhaustive matching of elements. Using stimulus presentation to the right and left cerebral hemispheres, the right hemisphere initiated fast selections of "Same" for figural material and alone was responsible for the "Same"/"Different" response differential. Exp. 1 (n = 22) gave no differences for same-different, unilateral-bilateral stimulation, and left-right hemispheres. Exp. 2, using word meaning as the binary-choice task, also showed faster decisions for "Same" but a different left-hemisphere-dependent strategy. The nature of information processing in relation to binary-choice tasks is discussed and the utility of bihemispheric paradigms is demonstrated.
二选一范式是对理解基本决策过程至关重要的分类问题。一般来说，当受试者判断两个视觉刺激是否相同或仅相差一个元素时，做出“不同”的决策所需时间更长。这一发现出乎意料，因为做出“不同”的决策不应需要对元素进行详尽匹配。通过向左右脑半球呈现刺激，右半球对图形材料快速做出“相同”的选择，并且独自导致了“相同”/“不同”反应差异。实验1（n = 22）在相同-不同、单侧-双侧刺激以及左右脑半球方面未发现差异。实验2以词义作为二选一任务，也显示出对“相同”的决策更快，但采用了一种不同的依赖左半球的策略。本文讨论了与二选一任务相关的信息处理的性质，并证明了双半球范式的效用。
