预先信息的不确定性与准备时间对任务切换的影响  

The Effect of Foreknowledge and Preparation Time on Task Switching

作　　者：黄四林[1,2] 林崇德[2] 胡清芬[2] 罗良[2] 陈桄[2] 

机构地区：[1]中央财经大学社会发展学院心理学系,北京100081 [2]北京师范大学发展心理研究所,北京100875

出　　处：《心理学报》2010年第3期367-376,共10页Acta Psychologica Sinica

基　　金：国家自然科学基金资助项目"思维过程中的执行加工与自我监控:事件相关脑电位研究"(批准号:30670717)

摘　　要：为揭示任务切换中切换代价的本质,考察了预先信息与准备时间对任务切换的影响,结果发现:(1)预先信息对任务切换有显著的影响效应,全部信息的反应时和切换代价显著低于无信息和部分信息的反应时和切换代价,而后二者之间无显著差异;(2)预先信息的影响效应受到准备时间的调节作用,在准备时间为100ms时,预先信息无显著的影响效应,而在准备时间达到600ms以后,预先信息的准备效应显著。这说明,预先信息影响的认知加工是任务设置重构,并且这种影响效应受到准备时间的调节作用。In task switching, switch cost is the performance differences in task-switch and task-repetition trials. Recently, some researches have attempted to specify nature and origins of switch cost to uncover the mechanisms underlying task switching performance. Theoretically, there is disagreement as to whether switch cost actually represents the task-set reconfiguration or the task-set inertia. Many studies found that a prolonged preparation time reduces switch costs, which has been attributed to a task set reconfiguration process. However, unlike manipulations of preparation time, other studies varied the predictability of task sequence and found that the preparation benefit was the same for switches and repetitions. The aim of the present study was to investigate the effect of foreknowledge and preparation time on task switching. Two experiments were conducted in the present study. There were 30 participants （12 males and 18 females） volunteered to take part in experiment 1 and another 30 participants （9 males and 21 females） took part in experiment 2. In order to investigated the effect of foreknowledge on task switching, the experiment 1 was conducted with a 3 （foreknowledge type： no foreknowledge, part foreknowledge and full foreknowledge） x 2 （task type： switch task and repetition task） within-subject design. In the experiment 2, a 3 （preparation time： lOOms, 600ms and 1000ms） x 3 （foreknowledge type： no foreknowledge, part foreknowledge and full foreknowledge） ~ 2 （task type： switch task and repetition task） within-subject design was conducted to examined the mechanisms of effects of foreknowledge on task switching under the conditions of difference preparation time. The correct RT and switch cost were measured as the main index. The results showed that： （1） the amount of switch cost depend on foreknowledge, switch cost was smaller with full foreknowledge than with part and no foreknowledge, but not difference significantly between the later two. （2） The interac

关 键 词：任务切换 切换代价 预先信息 执行控制 

分 类 号：B842.1[哲学宗教—基础心理学]