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Precise timing accounts for posttraining sleep-dependent enhancements of the auditory mismatch negativity.

Abstract：

:Memory consolidation is a long-lasting dynamic process by which new acquired information is transformed at different analysis levels, from molecules to cognition, without additional practice. Results from a previous study on event-related potentials (ERPs) suggest that part of the neural events promoting changes in the electrophysiological correlates of enhanced automatization in a sound discrimination task occur during sleep. These data were reanalyzed in the present study at the single-trial level, and results indicated that the first night of sleep succeeding training is absolutely required to improve the timing consistency of cortical neural assemblies involved in automatic sound-change detection, as revealed by a significant reduction in the latency-jitter of the MMN response across trials. This change in the regularity of the brain response to previously trained sounds facilitated involuntary switch of attention towards the same sounds when they were task irrelevant, as reflected by the P3a emergence after posttraining sleep. Both responses were, however, prevented in subjects deprived of sleep the night following training in the sound discrimination task. We hypothesize that the reduction in the MMN latency-jitter, which, in turn, triggered an automatic shift of attention, might result from a change in synaptic efficacy and/or neural excitability, rather than from changes in firing synchronization and/or size of representation.

journal_name

Neuroimage

journal_title

NeuroImage

authors

Atienza M,Cantero JL,Quian Quiroga R

doi

10.1016/j.neuroimage.2005.02.014

keywords:

subject

Has Abstract

pub_date

2005-06-01 00:00:00

pages

628-34

issue

2

eissn

1053-8119

issn

1095-9572

pii

S1053-8119(05)00108-4

journal_volume

26

pub_type

临床试验,杂志文章

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