视觉选择性注意条件下刺激目标异步性变化对线索效应的影响

The influence of varying SOA on cue effect under the conditions of endogenous and exogenous attention

采用Posner的内源性注意和外源性注意实验范式，以判断具有视觉空间编码和言语空间编码的数字奇偶判断为任务，材料为1—9的阿拉伯数字，被试为在校大学生，考察内源性和外源性注意条件下刺激目标异步性（SOA）系统变化对线索效应的影响。结果发现：在内源性注意条件下，随着刺激目标异步性的逐渐增加，线索提示效度效应表现出逐渐增大的趋势，当SOA达到900ms时，线索效应最明显；在外源性注意条件下，当刺激目标异步性为300ms时，线索提示效度效应达到最显著水平，但随着SOAs的逐渐增加，线索效应呈逐渐减小的趋势。

In present study, Posner＇ s endogenous and exogenous experimental paradigms were used to investigate cue effect when SOAs were different. The stimuli were numbers （ 1 - 9 ） in Arabic. Subjects were undergraduates. The task was to decide whether the presented number was odd or even. The results showed that： in the endogenous attention, with SOAs increasing, cue valid effect was increased gradually. When the SOA reached 900ms, cue effect was most significant. In the exogenous attention, when SOA was increased to 300ms, cue effect was most significant. But with the increasing of SOAs, cue valid effect was gradually decreased.