Sleep-dependent neurophysiological processes in implicit sequence learning.

  • Urbain C
  • Schmitz R
  • Schmidt C
 et al. 
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Behavioral studies have cast doubts about the role that post- tween RTs (faster RTs for Gthan NG), together with NG-related training sleep may play in the consolidation of implicit se- quence learning. Here, we used event-related fMRI to test the hypothesis that sleep-dependent functional reorganization would take place in the underlying neural circuits even in the possible absence of obvious behavioral changes. Twenty-four healthy human adults were scanned at Day 1 and then at Day 4 during an implicit probabilistic serial RT task. They either slept normally (RS) or were sleep-deprived on the first post- training night. Unknown to them, the sequential structure of the material was based on a probabilistic finite-state grammar, with 15% chance on each trial of replacing the rules-based grammatical (G) stimulus with a nongrammatical (NG) one. Results indicated a gradual differentiation across sessions be-

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  • Charline Urbain

  • Rémy Schmitz

  • Christina Schmidt

  • Axel Cleeremans

  • Patrick Van Bogaert

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