Journal Article

Distinct Neurophysiological Mechanisms Support the Online Formation of Individual and Across-Episode Memory Representations

A. Sans-Dublanc, E. Mas-Herrero, J. Marco-Pallarés and L. Fuentemilla

in Cerebral Cortex

Volume 27, issue 9, pages 4314-4325
Published in print September 2017 | ISSN: 1047-3211
Published online August 2016 | e-ISSN: 1460-2199 | DOI: https://dx.doi.org/10.1093/cercor/bhw231
Distinct Neurophysiological Mechanisms Support the Online Formation of Individual and Across-Episode Memory Representations

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  • Neurology
  • Clinical Neuroscience
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Abstract

Individual experiences often overlap in their content, presenting opportunities for rapid generalization across them. In this study, we show in 2 independent experiments that integrative encoding—the ability to form individual and across memory representations during online encoding—is supported by 2 distinct neurophysiological responses. Brain potential is increased gradually during encoding and fit to a trial level memory measure for individual episodes, whereas neural oscillations in the theta range (4–6 Hz) emerge later during learning and predict participants’ generalization performance in a subsequent test. These results suggest that integrative encoding requires the recruitment of 2 separate neural mechanisms that, despite their co-occurrence in time, differ in their underlying neural dynamics, reflect different brain learning rates and are supportive of the formation of opposed memory representations, individual versus across-event episodes.

Keywords: EEG; ERP; generalization; inferential learning; theta rhythm

Journal Article.  9555 words.  Illustrated.

Subjects: Neurology ; Clinical Neuroscience ; Neuroscience

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