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ID 838
file
title alternative
Changes of hypnagogic imagery and EEG stages
creator
Katoh, Kohichi
Hori, Tadao
subject
入眠期
脳波段階
入眠時心像
反応時間
NDC
Medical sciences
abstract
The aim of this study is to investigate the relationships between hypnagogic imagery and EEG stages. According to Hori, et al. (1994), the hypnagogic EEGs was classified into 9 stages, those were 1) alpha wave train, 2) alpha wave intermittent (>50%), 3) alpha wave intermittent (<50%), 4) EEG flattening, 5) ripples, 6) vertex sharp wave solitary, 7) vertex sharp wave bursts, 8) vertex sharp wave and incomplete spindles, 9) spindles. EEGs (Fz, Cz, Oz) were recorded from light off to 90 min elapsed. The subjects pressed a button when pip tones (1000Hz, 50dB, max duration : 5s, ISI : 50-70s) were presented, and reported their psychological experiences. The results showed that reaction time prolonged with progress of the hypnagogic EEG stages. The hypnagogic imageries mostly experienced when theta waves or a vertex sharp wave occurred. These imageries were almost composed of visual imageries (88%), involved 1) persons (37%), 2) static objects (21%), 3) landscapes (10%), and 4) colored patterns (8%). These imageries changed from waking daydreams to hypnagogic imageries or NREM sleep dreams as a function of progress of hypnagogic EEG stages.
journal title
Memoirs of the Faculty of Integrated Arts and Sciences, Hiroshima University. IV, Science reports
volume
Volume 24
start page
59
end page
73
date of issued
1998-12-28
publisher
広島大学総合科学部
contributor
国立情報学研究所
date of created
2006-03-21
issn
1340-8364
ncid
SelfDOI
language
jpn
nii type
Departmental Bulletin Paper
HU type
Departmental Bulletin Papers
DCMI type
text
format
application/pdf
text version
publisher
department
Graduate School of Integrated Arts and Sciences
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