Institute of Psychology, University of Zurich, Zurich, Switzerland.
Psychophysiology. 2013 Nov;50(11):1133-46. doi: 10.1111/psyp.12126. Epub 2013 Sep 9.
We recorded ERPs to investigate whether the visual memory load can bias visual selective attention. Participants memorized one or four letters and then responded to memory-matching letters presented in a relevant color while ignoring distractor letters or letters in an irrelevant color. Stimuli in the relevant color elicited larger frontal selection positivities (FSP) and occipital selection negativities (OSN) compared to irrelevant color stimuli. Only distractors elicited a larger FSP in the high than in the low memory load task. Memory load prolonged the OSN for all letters. Response mapping complexity was also modulated but did not affect the FSP and OSN. Together, the FSP data suggest that high memory load increased distractability. The OSN data suggest that memory load sustained attention to letters in a relevant color until working memory processing was completed, independently of whether the letters were in working memory or not.
我们记录了 ERPs，以研究视觉记忆负荷是否会影响视觉选择性注意。参与者记忆一个或四个字母，然后对呈现相关颜色的记忆匹配字母做出反应，同时忽略干扰字母或无关颜色的字母。与无关颜色的刺激相比，相关颜色的刺激引起了更大的额部选择正波（FSP）和枕部选择负波（OSN）。只有在高记忆负荷任务中，干扰物才会引起比低记忆负荷任务更大的 FSP。记忆负荷延长了所有字母的 OSN。反应映射的复杂性也受到了调节，但并没有影响 FSP 和 OSN。总的来说，FSP 数据表明高记忆负荷增加了分心。OSN 数据表明，记忆负荷持续关注相关颜色的字母，直到工作记忆处理完成，而不管字母是否在工作记忆中。
