Human parahippocampal activity:non-REM and REM elements in wake-sleep transition

Bódizs, Róbert, Sverteczki, Melinda, Lázár, Alpár Sándor and Halász, Péter (2005) Human parahippocampal activity:non-REM and REM elements in wake-sleep transition. Brain Research Bulletin, 65 (2). pp. 169-176. ISSN 0361-9230

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The covert-rapid-eye-movement (REM) sleep hypothesis of dreaming suggests that elements of REM sleep emerge during sleep onset, leading to vivid hypnagogic imagery. Based on parahippocampal electrocorticography of epileptic patients we found an increase in REM-like 1.5-3.0 Hz parahippocampal activity during wake-sleep transition, which peaks after on average 30s of sleep onset, and reaches 82% of REM sleep value. The increase in 1.5-3.0 Hz parahippocampal activity followed alpha dropout, but did not relate to short-term fluctuations in alpha waves or sleep spindles. Non-REM sleep-specific slow (<1.25 Hz) activity showed a continuous increase during wake-sleep transition in both temporal scalp and parahippocampal recordings. It is suggested that REM-like parahippocampal rhythmic slow activity is an after-effect of hypothalamic wake-promoting centers' switch-off at sleep onset, leading to an inhibited hippocampal functioning and hypnagogic hallucinations.

Item Type: Article
Uncontrolled Keywords: cortical synchronization,electrodes, implanted,electroencephalography,epilepsy,hallucinations,hippocampus,humans,hypothalamus,models, neurological,neural inhibition,neural pathways,parahippocampal gyrus,sleep,sleep, rem,wakefulness
Faculty \ School: Faculty of Medicine and Health Sciences > School of Health Sciences
UEA Research Groups: Faculty of Medicine and Health Sciences > Research Groups > Dementia & Complexity in Later Life
Faculty of Medicine and Health Sciences > Research Centres > Lifespan Health
Depositing User: Pure Connector
Date Deposited: 07 Dec 2016 00:07
Last Modified: 19 Oct 2023 01:52
DOI: 10.1016/j.brainresbull.2005.01.002

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