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Original Articles

The costs of suppressing stressful memories

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Pages 1496-1512 | Received 27 Oct 2005, Published online: 08 Oct 2007
 

Abstract

We investigated the costs of suppressing emotional and nonemotional memories, as evidenced in response times on a concurrent sentence verification task with three levels of syntactic complexity. Participants suppressing memories of personal negative experiences (n=26) had slower response times compared to the control group (n=23) and to participants suppressing nonemotional memories (n=25) particularly on the most complex sentences. Participants suppressing nonpersonal negative experiences (n=26) did not differ from either of the other two suppression groups. Suppression failures did not differ between conditions, but failures during the sentence task were related to the intrusiveness of the memory being suppressed. The findings indicate that different kinds of memories have different suppression costs and that even successful thought suppression can impair performance on concurrent tasks, supporting Wegner's ironic processing model in which suppression attempts must compete with other ongoing tasks for scarce mental resources.

Acknowledgements

We thank Jennifer Thakur, Jennie Grammer, Jennifer Sorenson, Nicole Osowski and Kelly Carrier for their able assistance as experimenters and data coders.

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