Nicholls M E
Department of Experimental Psychology, University of Cambridge, U.K.
Neuropsychologia. 1994 Feb;32(2):209-20. doi: 10.1016/0028-3932(94)90006-x.
Divided visual field techniques were used to investigate hemispheric asymmetries for the threshold of fusion of two flashes in a group of right-handed adults. A right visual field (RVF) advantage was found and this was interpreted in terms of the left hemisphere's enhanced capacity for the detection of fine temporal events. This asymmetry could be the result of either (a) a structural advantage (where an asymmetry in physical access exists); or (b) an attentional bias (where attention is biased to one side). In order to assess the contribution of attentional and structural factors, attention was manipulated during the experiment by a centrally located arrow which could give neutral, valid (80%) or invalid cues (20%). Reaction time measures showed a cost for invalid trials relative to valid trials. This effective manipulation of attention for the valid and invalid trials had no effect on the RVF advantage relative to the baseline (neutral) trials. It was concluded that attentional biases play no significant role in the RVF advantage for two-flash fusion.
采用分视野技术对一组右利手成年人进行研究，以探究两闪光融合阈值的半球不对称性。结果发现右侧视野（RVF）具有优势，这被解释为左半球在检测精细时间事件方面能力增强。这种不对称可能是以下两种情况之一导致的：（a）结构优势（存在物理通路的不对称）；或（b）注意力偏差（注意力偏向一侧）。为了评估注意力和结构因素的作用，实验过程中通过位于中央的箭头来操纵注意力，该箭头可以给出中性、有效（80%）或无效提示（20%）。反应时测量结果显示，与有效试验相比，无效试验存在代价。这种对有效和无效试验的注意力有效操纵，相对于基线（中性）试验而言，对RVF优势没有影响。研究得出结论，注意力偏差在两闪光融合的RVF优势中不起显著作用。
