Effects of stimulus features and instruction on response coding, selection, and inhibition: Evidence from repetition effects under task switching
Effects of stimulus features and instruction on response coding, selection, and inhibition: Evidence from repetition effects under task switching
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DOI：
10.1080/17470210701643397
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发表时间：
2008-10-01
影响因子：
1.7
通讯作者：
Huebner, Ronald
中科院分区：
文献类型：
--
作者：
Druey, Michel D.;Huebner, Ronald
刺激和反应的编码对人类行为至关重要。在这里，我们主要关注响应代码（或响应类别）。作为一种方法，我们采用了一个固定的任务到手的映射相结合的双任务和任务切换范式。通常，负面影响（即，成本）被观察到的任务切换下的响应类别重复。然而，在之前的几项研究中，已经提出，如果刺激类别（例如，“奇数”，如果数字必须根据它们的奇偶性特征来分类的话）被明确地映射到特定的响应。我们的目的是检验这一假设。在本实验中，我们能够区分三种不同类型的可能响应代码。研究结果表明，被试一般根据抽象的反应特征（左/右，或食指/中指）来编码他们的反应。此外，空间代码比手指型代码更受欢迎，即使指令强调后者。然而，这种偏好似乎是由于刺激-反应特征重叠造成的，因此空间反应类别由各自的刺激特征引发。如果没有这样的重叠，指令确定哪种类型的反应代码参与反应选择和抑制。
The coding of stimuli and responses is crucial for human behaviour. Here, we focused primarily on the response codes (or response categories). As a method, we applied a combined dual-task and task-switch paradigm with a fixed task-to-hand mapping. Usually, negative effects (i.e., costs) are observed for response category repetitions under task switching. However, in several previous studies it has been proposed that such repetition effects do not occur, if the stimulus categories (e.g., "odd" if digits have to be classified according to their parity feature) are unequivocally mapped to specific responses. Our aim was to test this hypothesis. In the present experiments, we were able to distinguish between three different types of possible response codes. The results show that the participants generally code their responses according to abstract response features (left/right, or index/middle finger). Moreover, the spatial codes were preferred over the finger-type codes even if the instructions stressed the latter. This preference, though, seemed to result from a stimulus-response feature overlap, so that the spatial response categories were primed by the respective stimulus features. If there was no such overlap, the instructions determined which type of response code was involved in response selection and inhibition.