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- W3100299020 abstract "Converging evidence supports the non-monotonic plasticity hypothesis that although complete retrieval may strengthen memories, partial retrieval weakens them. Yet, the classic experimental paradigms used to study effects of partial retrieval are not ideally suited to doing so, because they lack the parametric control needed to ensure that the memory is activated to the appropriate degree (i.e., that there is some retrieval, but not enough to cause memory strengthening). Here we present a novel procedure designed to accommodate this need. After participants learned a list of word-scene associates, they completed a cued mental visualization task that was combined with a multiple-object tracking (MOT) procedure, which we selected for its ability to interfere with mental visualization in a parametrically adjustable way (by varying the number of MOT targets). We also used fMRI data to successfully train an classifier for use in this task: this classifier revealed greater memory reactivation during trials in which associative memories were cued while participants tracked one, rather than five MOT targets. However, the classifier was insensitive to task difficulty when recall was not taking place, suggesting it had indeed tracked memory reactivation rather than task difficulty per se. Consistent with the classifier findings, participants' introspective ratings of visualization vividness were modulated by task difficulty. In addition, classifier output and slowing of responses in a post-reactivation memory test suggested that partial reactivation, induced by MOT, weakened memory. We argue that this procedure has desirable properties for future investigation of partial retrieval effects, e.g., in closed-loop experiments." @default.
- W3100299020 created "2020-11-23" @default.
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- W3100299020 date "2017-02-16" @default.
- W3100299020 modified "2023-09-26" @default.
- W3100299020 title "Parametrically scalable memory reactivation using multiple object tracking" @default.
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