Automatic auditory information processing in sleep

Citation
T. Nashida et al., Automatic auditory information processing in sleep, SLEEP, 23(6), 2000, pp. 821-828
Citations number
24
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Neurosciences & Behavoir
Journal title
SLEEP
ISSN journal
0161-8105 → ACNP
Volume
23
Issue
6
Year of publication
2000
Pages
821 - 828
Database
ISI
SICI code
0161-8105(20000915)23:6<821:AAIPIS>2.0.ZU;2-9
Abstract
Study Objectives: The mismatch negativity (MMN) component of the event-rela ted potentials reflects the automatic detection of sound change. Only a few researchers have investigated the MMN elicitation during sleep in adult hu man and some of them reported that MMN amplitude was decreased in sleep com pared to in waking. However, it is not clear that the decrease of MMN ampli tude was due to increased drowsiness or long-term response decrement. Two e xperiments were conducted to clarify whether or not the MMN was elicited in each sleep stage. We presented auditory stimuli to subjects continuously f rom waking until sleep state (Experiment 1). Using the same experimental co ndition, we examined whether or not MMN amplitude was influenced by long-te rm stimulus presentation (80min.) and by vigilance level (Experiment 2). Design: N/A Setting: N/A Participants: N/A Interventions: N/A Measurements & Results: Experiment 1. MMN was obtained in both drowsiness a nd REM sleep. MMN was significantly smaller in amplitude and shorter in lat ency in the both stages than in the waking state. However, MMN was not foun d in another sleep stage. Experiment 2: Amplitudes were no different among 0-20 min., 20-40 min., 60-80 min. But it was decreased in 40-60 min. and po wer value of alpha-wave was decreased in 40-60 min. Conclusions: To obtain the reliable data, by using the automatic spectral a nalysis, we confirmed that MMN was elicited in REM sleep. MMN was not influ enced by long-term stimulation. The result suggested that auditory stimuli could be processed in the preattentive sensory memory even in REM sleep.