Explaining response-repetition effects in task switching: evidence from switching cue modality suggests episodic binding and response inhibition
Explaining response-repetition effects in task switching: evidence from switching cue modality suggests episodic binding and response inhibition
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DOI：
10.1007/s00426-017-0847-9
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发表时间：
2018-05-01
影响因子：
2.3
通讯作者：
Schuch, Stefanie
中科院分区：
文献类型：
--
作者：
Koch, Iring;Frings, Christian;Schuch, Stefanie
任务转换研究表明，通常的反应-重复益处被废除，如果任务转换，往往会逆转。根据情景捆绑解释，进行反应会加强任务特定的捆绑，导致任务重复中的反应-重复益处，而这种捆绑可能导致任务切换中的干扰(即，解除捆绑的代价)。另一种解释认为，反应通常在执行后被抑制，但反应抑制的顺序传递被任务重复中刺激类别的正启动过度补偿(导致在反应-重复条件下产生正的净效应)。在本研究中，我们操纵任务线索通道(视觉和听觉)来引入不同的编码和提取语境，这应该会改变情景捆绑的强度。通过两个实验(实验1A显示了最初的证据，实验1B提供了成功的复制)，我们发现重复线索通道的反应-重复收益显著大于改变线索通道，这表明线索通道启动了任务特定刺激类别和反应的提取。然而，在任务转换中观察到的反应-重复成本仍然不受这种背景变化的影响。这一数据模式表明了一种混合的解释，假设反应-重复的好处是由情景绑定驱动的，而反应-重复的成本主要是由于(非情景)反应抑制的继续。
Task switching studies revealed that the usual response-repetition benefit is abolished and often reversed if the task switches. According to episodic binding accounts, performing responses strengthens task-specific bindings, leading to response-repetition benefits in task repetitions, whereas such bindings can lead to interference (i.e., costs of "unbinding") in task switches. An alternative account assumes that responses are generally inhibited after execution but that the assumed sequential carryover of response inhibition is overcompensated by positive priming of stimulus category in task repetitions (resulting in a positive net effect in response-repetition conditions). In the present study, we manipulated task-cue modality (visual vs. auditory) to introduce a variation of encoding and retrieval context, which should vary the strength of episodic bindings. Across two experiments (Experiment 1A, showing the initial evidence, and Experiment 1B, providing a successful replication), we found that the response-repetition benefit in task repetitions was substantially larger with repeated cue modality than with changed cue modality, suggesting that cue modality primes retrieval of task-specific stimulus categories and responses. However, the observed response-repetition cost in task switches remained unaffected by this contextual change. This data pattern suggests a hybrid account, assuming that response-repetition benefits are driven by episodic bindings, whereas response-repetition costs are primarily due to (non-episodic) carryover of response inhibition.