基于客体工作记忆内容的保持对时间判断的影响

本研究通过操作工作记忆内容的有效性，探讨了记忆内容的保持对时间判断的影响。采用不规则的客体作为实验材料，使时间任务中的刺激与工作记忆内容匹配或不匹配。实验1采用工作记忆和时间判断的双任务范式，要求被试首先记忆一个客体，然后在每个试次的最后判断测试刺激是否与记忆项相同。在延迟阶段，被试判断连续出现的两个刺激的时距哪个更长（或更短）。实验2中，要求被试忽略第一个刺激，仅完成时间判断任务。结果发现，相比单任务的计时，双任务条件下，工作记忆内容的保持延长了时间判断的时间。而且，在记忆匹配和知觉匹配条件下，匹配刺激呈现的时间越长，正确率越低，反应时越长。这说明记忆内容的保持增加了决策的难度，工作记忆内容对时间判断的可能是由记忆内容引起的注意定向造成的。

Maintenance of object working memory on time perception

The current study explored the effect of retention of working memory content on time judgment by manipulating the validity of WM content. We used irregular objects as experimental stimuli, and made the object during duration judgment match the WM content or not. In Experiment 1, using a dual task paradigm combing working memory and time judgment task, we asked participants first to memorize an object, and indicate whether a test object changed at the end of each trial. During the delay period, participants had to judge which of two successive objects was presented longer (or shorter). In Experiment 2, participants were required to ignore the first object, and only to perform time judgment task. The results revealed that in comparison with single timing task, retention of WM content prolonged the decision time of duration judgment. Furthermore, in memory-matching and perception-matching conditions, there were lower precision and longer decision time when matching stimuli had a longer duration than mismatching ones, as compared to when matching objects had a shorter duration than mismatching ones. This study suggests that maintenance of WM information did increased the difficulty of decision, WM content-based interference might be caused by attentional orientation derived from WM content.