认知与发展心理学研究室知识库

以往研究关于视觉工作记忆回溯线索效应的产生机制主要存在5种假设,目前依然存在争议。本研究通过改进前人研究实验范式,采用包含内源性回溯线索的颜色回忆报告范式,进一步对这5种假设进行检验。在实验1中,我们调控了线索与探测阵列之间的时间间隔,发现不同时间间隔不影响无线索条件的行为表现,而在正常线索条件中被试的记忆精度以及能记住的项目数量均优于无线索条件;在实验2中,我们对回溯线索伴随的干扰刺激类型进行控制,结果显示,在不同条件下记忆精度不存在差别,但当回溯线索伴随干扰刺激呈现时,被试能记住的项目数量会被降低,降低程度受干扰刺激的类型调制;在实验3中,我们对伴随回溯线索的干扰刺激的呈现时间进行控制,发现虽然回溯线索效应仍然存在,但干扰刺激的呈现时间不会影响效应程度。研究结果表明,回溯线索的出现使得被试能够在决策加工前完成内部注意资源的再分配,从而避免了同时进行这两种认知加工与记忆表征维持本身竞争认知资源。本研究为认知阶段分离假设提供了支持证据,对解决回溯线索效应产生机制的争议以及理解内部注意与视觉工作记忆的关系有重要意义。

Retro-cue effect (RCE) refers to the phenomenon that individuals can use retro-cues to improve their visual working memory (VWM) performance of target items after the disappearance of memory targets. To explain the mechanism of RCE in VWM, five different hypotheses have been proposed by previous studies: the hypothesis of enhancing target representations, the hypothesis of forgetting non-target representations, the hypothesis of preventing memory degradation, the hypothesis of preventing interference from probe array and the hypothesis of cognitive phase separation. Although RCE has been repeatedly observed in previous studies, the mechanism of RCE remains unclear. In this study, we conducted three experiments to test these hypotheses.

In Experiment 1, participants were asked to memorize four colors in a recall task. They needed to recall the color of the target item when the probe array presented. There are three experimental conditions, the normal cue condition, the short interval no-cue condition, and the long interval no-cue condition. In the normal cue condition, a memory array (four colored squares) presented for 200 ms. Then, the memory array disappeared for 450 ms and a retro-cue presented, followed by a 900 ms blank. Then the probe array presented. In the short interval no-cue condition and long interval no-cue condition, no retro-cue presented after the memory array, but the probe array would present after the memory array disappeared for 450 ms (short interval no-cue condition) or 1400 ms (long interval no-cue condition). The design and procedure of Experiment 2 were similar to those of Experiment 1, except we used a grey-wheel cue condition and a colored-wheel cue condition to replace the long interval no-cue condition. These two new conditions were similar to the normal cue condition, except the retro-cue would appear with a distractor of a gray wheel (grey-wheel cue condition) or with a distractor of a colored wheel (colored-wheel cue condition). The design and procedure of Experiment 3 were similar to those of Experiment 2, except a long-grey-wheel short-cue condition and a long-grey-wheel long-cue condition were used to replace the normal cue condition and colored cue condition. In the long-grey-wheel short-cue condition, the retro-cue presented for 100 ms, but the grey wheel presented for 1000 ms. In the long-grey-wheel long-cue condition, the retro-cue and grey wheel presented for 1000 ms.

国家自然科学基金(31700948)资助