工作记忆中的部分线索效应:任务呈现方式的影响

以往研究主要在长时记忆中考察部分线索效应，很少关注工作记忆中的部分线索效应及其作用机制。本研究采用项目再认任务，考察了工作记忆中提供部分学习项目作为提取线索，对存储在工作记忆中的已有表征的影响。结果发现：有、无部分线索试次分组呈现时，相较于无部分线索条件，有部分线索条件下再认正确率和d'降低，β升高，反应时间延长；有、无部分线索试次随机混合呈现时，有部分线索条件下再认正确率降低，β升高，但反应时间并无显著延长。结果表明：工作记忆中部分线索的提供降低了目标项目的表征强度；研究结果可用提取抑制假说解释，但工作记忆中部分线索的作用可能受注意资源有限性制约。

Part-list Cuing Effect in Working Memory: Effects of Task Presentation Mode

When people are asked to recall words they have studied earlier from a list, those given a subset of these words as cues recall fewer words than people who do not receive any cues. This phenomenon is the so called part-list cuing effect. Whereas many studies have examined part-list cuing effect in long-term memory, the mechanisms and effects of part-list cuing effect within working memory are less well understood. The current study tests how part-list cuing instructions delivered in a working memory task influence veridical memory over the short term.Using a modified item recognition task, and adopting category-sample words as stimulus, we investigated the part-list cuing effect in working memory through two experiments. The cue trials and uncue trials in Experiment 1 were presented in separate blocks. While in Experiment 2, the cue trials and uncue trials were presented in the same block with a pseudo-random order. The accuracy and reaction time were chosen as statistical indexes.The results show that:(1) The part-list cuing effect exists in working memory; (2) When the cue trials and uncue trials were presented in separate blocks, participants' recognition accuracy and discriminability were lower in the part-list cuing condition than in the non-cue condition, and the reaction time was longer in the part-list cuing condition, whereas the response bias was higher in the part-list cuing condition; (3) When the cue trials were randomly interleaved with uncue trials, participants' recognition accuracy was lower in the part-list cuing condition than in the non-cue condition, the response bias was higher in the part-list cuing condition, whereas discriminability and reaction time were not significant different under the two conditions.The results of this study imply that the task presentation mode has influence on memory performance for part-list cuing effect in working memory. Partial results provide evidence for the retrieval inhibition hypothesis, but the effect of part-list cues was constraint to a limited attention resource in working memory.