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Abstract
In a series of three experiments, increasing working memory (WM) load was demonstrated to reduce the executive control of attention, measured via task-switching and inhibitory control paradigms. Uniquely, our paradigms allowed comparison of the ability to exert executive control when the stimulus was either part of the currently rehearsed memory set or an unrelated distractor item. The results demonstrated a content-specific effect—insofar as switching attention away from, or exerting inhibitory control over, items currently held in WM was especially difficult—compounded by increasing WM load. This finding supports the attentional control theory that active maintenance of competing task goals is critical to executive function and WM capacity; however, it also suggests that the increased salience provided to the contents of WM through active rehearsal exerts a content-specific influence on attentional control. These findings are discussed in relation to cue-induced ruminations, where active rehearsal of evocative information (e.g., negative thoughts in depression or drug-related thoughts in addiction) in WM typically results from environmental cuing. The present study has demonstrated that when information currently maintained in WM is reencountered, it is harder to exert executive control over it. The difficulty with suppressing the processing of these stimuli presumably reinforces the maintenance of these items in WM, due to the greater level of attention they are afforded, and may help to explain how the cue-induced craving/rumination cycle is perpetuated.
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Department of Psychology, Trinity College, Dublin 2, Ireland
Robert Hester & Hugh Garavan
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- Hugh Garavan
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Correspondence toHugh Garavan.
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This research was supported by USPHS Grant DA14100 and GCRC Grant M01 RR00058.
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Hester, R., Garavan, H. Working memory and executive function: The influence of content and load on the control of attention.Mem Cogn33, 221–233 (2005). https://doi.org/10.3758/BF03195311
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