The present study investigated the functional characteristics of task-sets that were never applied before and were formed only on the basis of instructions. We tested if such task-sets could elicit a task-rule congruency effect, which implies the automatic activation of responses in the context of another task. To this end, a novel procedure was developed that revealed instruction-based task-rule congruency effects in two experiments. Although the effect seems quite general (Experiment 1) it still necessitates the formation of a task-set as it cannot be induced by the mere maintenance of instructions in declarative working memory (Experiment 2). We conclude that a task-set representing only key features of an upcoming task can be formed on the basis of instructions alone to such a degree that it can automatically trigger a response tendency in another task. Implications of our results for the impact of instructions on performance in general, and for the occurrence of task-rule congruency effects in particular, are discussed.Keywords: task-set, task switching, task-rule congruency, instructions
INSTRUCTION-BASED TASK-RULE CONGRUENCY EFFECTS 3
Instruction-based task-rule congruency effectsGoal-directed behavior is assumed to be based on task-sets that specify and group the control settings of different task-related processes, such as stimulus identification, response selection, and response execution (e.g., Vandierendonck, Liefooghe, & Verbruggen, 2010).While the functional properties of task-sets have been studied extensively in the taskswitching paradigm (see, Kiesel et al., 2010;Monsell, 2003;Vandierendonck et al., 2010 for reviews), only little is known on how task-sets are formed when the instructions of a particular task are presented. This is surprising because it seems obvious that instructions play an important role, for instance, by indicating which task to perform or how a task must be performed. Accordingly, the present study further investigated the functional characteristics of task-sets formed only on the basis of instructions. We tested if a task-set that is formed on the basis of instructions meant for a particular task that has not yet been executed, can elicit automatic response tendencies despite being irrelevant in the context of another task. This was done by using the task-rule congruency effect.
Task-Rule CongruencyThe task-rule congruency effect is a robust finding in task-switching studies that require participants to switch between two tasks (e.g., shape or color judgment) that share stimuli (e.g., colored shapes) and responses (e.g., a left or right response key; see, Kiesel et al., 2010;Monsell, 2003; Vandierendonck et al., 2010 for reviews). Each response thus has two -meanings‖ (e.g., circle and red for the left response and square and green for the right response) and stimuli trigger these two meanings, with one related to the relevant task and the other related to the irrelevant task. The task-rule congruency effect refers to the finding that RTs are shorter when both respo...