Sleep Medicine
July 1, 2018
Satomi Okabe, Kazuhiko Fukuda, Hiroko Mochizuki-Kawai et al.
As connections between nightmares and various psychiatric disorders have been reported, the clinical significance of studying dream emotionality is now growing in importance. Because the olfactory bulb connects directly to the amygdala odor presentation may be a crucial tool to study dream emotions. Previous studies have demonstrated that presentation of positive/negative odors during rapid eye...
Sleep
February 1, 2002
Tomoka Takeuchi, Kazuhiko Fukuda, Yuka Sasaki et al.
To further investigate mechanisms of isolated sleep paralysis (ISP) in normal individuals, we experimentally elicited ISPs by facilitating sleep onset REM periods (SOREMP), a prerequisite of ISPs, and examined behavioral and psychological measurements relating to ISP appearances. The multi-phasic sleep/wake schedule (MPS) began at approximately midnight and ended when net sleep reached 7.5...
Psychiatry and Clinical Neurosciences
June 1, 2000
Kazuhiko Fukuda, Robert D. Ogilvie, Tomoka Takeuchi
Abstract There were no differences between Canada and Japan in the prevalence and symptoms of sleep paralysis (SP), but many more Canadians considered SP to be a dream. The difference was considered to be derived from the fact that there is a common expression for SP in Japan but there is not one in Canada. Then, we investigated why there are individuals who consider SP to be a dream and others...
Perceptual and Motor Skills
June 1, 1994
Tomoka Takeuchi, Akio Miyasita, Maki Inugami et al.
16 citations
During an experiment on nocturnal sleep interruption, we observed a unique case of hallucination without sleep paralysis during the sleep-onset REM period in a normal individual. We documented the polysomnogram recorded during this hallucination. The polysomnogram showed a mixed pattern of Stages REM and W, with muscle-tone inhibition, rapid eye movements (REMs), slow eye movements (SEMs), and...
Perceptual and Motor Skills
December 1, 1993
Kazuhiko Fukuda
36 citations
In a previous study, the author and coworkers found 39.8% of healthy young adults had experienced sleep paralysis. Some other studies reported prevalence as about the same or higher (i.e., 40.7% to 62.0%) than that previous estimate, while yet other studies, including Goode's work cited by ASDC and ASDA classifications, suggested much lower prevalences (i.e., 4.7% to 26.2%). The author tested...
Sleep
June 1, 1992
T Takeuchi, A Miyasita, Y Sasaki et al.
We elicited isolated sleep paralysis (ISP) from normal subjects by a nocturnal sleep interruption schedule. On four experimental nights, 16 subjects had their sleep interrupted for 60 minutes by forced awakening at the time when 40 minutes of nonrapid eye movement (NREM) sleep had elapsed from the termination of rapid eye movement (REM) sleep in the first or third sleep cycle. This schedule...
Perceptual and Motor Skills
December 1, 1991
Kazuhiko Fukuda, Nobuo Inamatsu, Makoto Kuroiwa et al.
19 citations
Sleep paralysis occurs in normal persons. This phenomenon had been studied psychoanalytically or in terms of the deviation of the victims' personality. This present study aimed to assess the personalities of such persons by using the MMPI and the Maudsley Personality Inventory. The subjects showed a slightly higher mean T score on the MMPI Paranoia Scale than those who did not have this...
Japanese Journal of Physiological Psychology and Psychophysiology
1989
Kazuhiko Fukuda
3 citations
In Japan, there is a set of experiences called kanashibari, which is symptomatically identical to sleep paralysis with or without hypnagogic hallucinations. In a former study (Fukuda et al., 1987a), the author and co-workers have investigated this phenomenon by a questionnaire method and have found that among the normal population the phenomenon is apparently more common than has been usually...
Sleep
June 1987
K Fukuda, A Miyasita, M Inugami et al.
In Japan, a set of experiences called kanashibari is considered identical with isolated sleep paralysis. We investigated this phenomenon by means of a questionnaire administered to 635 college students (390 men and 245 women). Of all subjects, about 40% had experienced at least one episode of kanashibari [subjects of K(+)]. Therefore, isolated sleep paralysis is apparently a more common...
Masako Hoshikawa, Kazuhiko Fukuda, Takamasa Kogure
Abstract Background Sleep paralysis and hypnagogic hallucinations are observed during sleep-onset rapid eye movement (REM) periods (SOREMPs). SOREMPs are associated with sleep pattern disruption. This study aimed to assess the occurrence of sleep paralysis and several sleep parameters in elite athletes and control groups to determine the relationship between sleep paralysis and specific sleep...