Norman W D, Jeeves M A, Milne A, Ludwig T
Redeemer College, Ancaster, Ontario, Canada.
Cortex. 1992 Dec;28(4):623-42. doi: 10.1016/s0010-9452(13)80231-6.
Twenty-five normal subjects made "same-different" responses to dot patterns presented in the LVF, RVF or bilaterally. Task difficulty was manipulated in each condition by varying the number of dots in the two patterns presented from two to four to six. The pairs of patterns always had the same number of dots on a given trial. Response latency and accuracy worsened as the number of dots increased for all three presentation conditions and for both "same" and "different" judgements. Overall, responding was faster and the number of errors lower on Bilateral presentations. For response latencies to identical patterns of dots, the size of the bilateral advantage increased relative to RVF responding as task difficulty increased but did not change significantly relative to LVF responding. When the two patterns were not identical the size of the advantage did not change as task difficulty increased. "Same" judgements were faster but less accurate than "different" judgements. A model of hemispheric interactions is proposed to account for the findings.
25名正常受试者对呈现于左视野、右视野或双侧的点图案做出“相同-不同”反应。在每种条件下，通过改变所呈现的两种图案中的点数，从两个到四个再到六个，来操控任务难度。在给定的试验中，图案对的点数总是相同的。对于所有三种呈现条件以及“相同”和“不同”判断，随着点数增加，反应潜伏期和准确性都变差。总体而言，双侧呈现时反应更快，错误数量更少。对于相同点图案的反应潜伏期，随着任务难度增加，双侧优势的大小相对于右视野反应有所增加，但相对于左视野反应没有显著变化。当两种图案不同时，优势大小不会随着任务难度增加而改变。“相同”判断比“不同”判断更快但准确性更低。提出了一种半球相互作用模型来解释这些发现。
