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Control of information in working memory: Encoding and removal of distractors in the complex-span paradigm

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)106-128
Number of pages23
JournalCognition
Volume156
Early online date20 Aug 2016
DOIs
DateAccepted/In press - 16 Aug 2016
DateE-pub ahead of print - 20 Aug 2016
DatePublished (current) - Nov 2016

Abstract

The article reports four experiments with complex-span tasks in which encoding of memory items alternates with processing of distractors. The experiments test two assumptions of a computational model of complex span, SOB-CS: (1) distractor processing impairs memory because distractors are encoded into working memory, thereby interfering with memoranda; and (2) free time following distractors is used to remove them from working memory by unbinding their representations from list context. Experiment 1 shows that distractors are erroneously chosen for recall more often than not-presented stimuli, demonstrating that distractors are encoded into memory. Distractor intrusions declined with longer free time, as predicted by distractor removal. Experiment 2 shows these effects even when distractors precede the memory list, ruling out an account based on selective rehearsal of memoranda during free time. Experiments 3 and 4 test the notion that distractors decay over time. Both experiments show that, contrary to the notion of distractor decay, the chance of a distractor intruding at test does not decline with increasing time since encoding of that distractor. Experiment 4 provides additional evidence against the prediction from distractor decay that distractor intrusions decline over an unfilled retention interval. Taken together, the results support SOB-CS and rule out alternative explanations. Data and simulation code are available on Open Science Framework: osf.io/3ewh7.

    Structured keywords

  • Memory

    Research areas

  • Complex span, Decay, Interference, Working memory

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  • Full-text PDF (accepted author manuscript)

    Rights statement: This is the accepted author manuscript (AAM). The final published version (version of record) is available online via Elsevier at http://dx.doi.org/10.1016/j.cognition.2016.08.007. Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 827 KB, PDF document

    Licence: CC BY-NC-ND

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