Human Sciences Press, Inc., New York City
Dreaming Volume 8, Number 2, June 1998
CONTENTS
Special Issue: Psychobiology of Dreaming
Special Issue Editors: Tore A. Nielsen, Ph.D. and Roseanne Armitage, Ph.D.
Publication Patterns in Dream Research: Trends
in the Medical and Psychological Literatures
Tore A. Nielsen and Anne Germain
Page 47
The Prevalence of Sleep Paralysis among Canadian
and Japanese College Students
Kazuhiko Fukuda, Robert D. Ogilvie, Lisa Chilcott,
Ann-Marie Vendittelli, and Tomoka Takeuchi
Page 59
Topographical EEG Mapping in a Case of Recurrent
Sleep Terrors
Antonio L. Zadra and Tore A. Nielsen
Page 67
A Laboratory Study of Sleep and Dreaming in
a Case of Asperger's Syndrome
Roger Godbout, Cybčle Bergeron, Emmanuel Stip, and Laurent Mottron
Page 75
Sleeping Dreams, Waking Hallucinations, and
the Central Nervous System
Mark W. Mahowald, Sharon R. Woods, and Carlos H. Schenck
Page 89
Dream Content in Patients with Narcolepsy:
Preliminary Findings
Michael Schredl
Page 103
EEG Correlates of Dream Recall in Depressed
Outpatients and Healthy Controls
Aaron Rochlen, Robert Hoffmann, and Roseanne Armitage
Page 109
Effects of Somatosensory Stimulation on
Dream Content in Gymnasts and Control Participants: Evidence of Vestibulomotor
Adaptation in REM Sleep
Anny Sauvageau, Tore A. Nielsen, and Jacques Montplaisir
Page 125
Tore A. Nielsen and Anne Germain
Publication Patterns in Dream Research:
Trends in the Medical and Psychological Literatures
Dreaming: Journal of the Association for the Study of Dreams. Vol 8(2)
47-58, Jun 1998.
Abstract:
The annual rate of journal publications is a pertinent index of a scientific
field's prosperity. In the present study, annual publication rates were
calculated for the field of dream research using both medical (Index Medicus,
MEDLINE) and psychological (PsychINFO) reference databases. A composite
profile from the medical database spanning 111 years revealed very similar
changes in publishing levels following the release of Freud's (1958/1900)
The Interpretation of Dreams and the publication in Science of Aserinsky
and Kleitman's (1953) article on dreaming and "rapid, jerky eye movements."
In both cases, the peak year occurred 15 years after release of the work,
and the peak was followed by a precipitous 3-year drop and then a slow
and yet variable decline. In the more recent case, the peak level (reached
in 1969) dropped (during 1970-1972) by about half and has continued a slow
decline to the present day. As is the case with basic sleep research, this
level of activity does not keep pace with either (1) global growth in scientific
publishing or (2) growth in related sleep disciplines, particularly, sleep
disorders and chronobiology. The psychological database confirms many features
of the medical database profile—but is advanced by 1 year, i.e., a publishing
peak in 1968, a drop from 1969-1971, and a slow decline until 1980. In
this case, however, 1981 marks the beginning of a period of renewed growth
that has endured to the present. This divergence between the two publishing
profiles may reflect the field's shift from psychophysiological to cognitive
and dream analytic approaches since the early 1980s.
Kazuhiko Fukuda, Ph.D. Robert D. Ogilvie, Ph.D., Lisa Chilcott,
Ann-Marie Vendittelli, and Tomoka Takeuchi, Ph.D.
The Prevalence of Sleep Paralysis among
Canadian and Japanese College Students
Dreaming: Journal of the Association for the Study of Dreams. Vol
8(2) 59-66, Jun 1998.
Abstract:
Although sleep paralysis had been treated as one of the symptoms of
narcolepsy, recently it has become recognized as occurring frequently in
normal individuals. However, among the few published studies that have
examined sleep paralysis, there are great discrepancies in its reported
prevalence. These discrepancies could be attributed to differences in survey
methods, to the description of the symptom employed in each study, or to
the race or culture of the research participants. We administered a questionnaire,
with equivalent Japanese and English forms, to 86 Canadian and 149 Japanese
university students. Although the reported prevalence of sleep paralysis
was almost the same (Canada: 41.9%, Japan: 38.9%), the characterization
of the phenomenon differed greatly between the two samples. Over 55% of
the Canadian and only about 15% of the Japanese students regarded the experience
as 'a kind of dream.' This difference may be one of the reasons for the
varying prevalence noted in previous studies. Although many Japanese students
(40.5%) and a very small number of Canadians (3.5%) usually prefer the
supine position while sleeping, the majority of both groups (Canada: 57.9%,
Japan: 83.8%) reported that, during the episodes of sleep paralysis, they
found themselves in the supine position.
Key Words: sleep paralysis; hypnagogic hallucinations; cultural differences
Abstract:
Sleep terrors are characterized by marked CNS arousal and typically
occur during stage 3-4 sleep within the first NREM cycle. Studies of the
EEG during sleep terrors suggest that delta power and synchrony in the
EEG may be important physiological markers of sleep terror presence and
intensity. An EEG mapping study was undertaken with a single participant
who experienced three sleep terror episodes in the laboratory. A one-minute
section of EEG was sampled immediately prior to the onset of each of the
three sleep terrors. Similar EEG sections were taken from 10 healthy sex-
and age-matched controls. The sleep terrors and control (normative) data
were then compared topographically with z-scores (z-mapping). The z-maps
indicated that all three sleep terrors contained more total and delta power
in central and frontal areas than the control EEG sections. Moreover, relative
delta power in these areas for the three sleep terrors was proportional
to the subjective intensity of the episode. Although this pre-arousal EEG
pattern may be related to ongoing slow-wave sleep mentation that may sometimes
trigger sleep terror episodes, its functional significance remains an open
question. The results demonstrate the utility of EEG mapping for the quantification of brain activation during sleep terror attacks
and suggest that discrete activity profiles are identifiable for different
types of dreaming-related arousal.
Key Words: EEG Mapping, Arousal, Sleep Terrors, Parasomnias
Abstract:
Asperger's Syndrome (AS) is a pervasive developmental disorder whose
continuity with High-Functioning Autism is still a matter of debate. Clinical
observations suggest that patients with AS may present the same sleep disorders
as autistic patients, including difficulties in initiating and maintaining
sleep as well as poor dream recall. We recorded the sleep of a 25-year-old
male patient with AS for two nights using a full EEG montage and compared
the second night to that of a group of normal participants. We found low
levels of slow wave sleep (SWS: stages 3 + 4), high levels of stage 1,
and a large number of awakenings. The organization of REM sleep was unremarkable,
including normal REM density. Analyses of phasic EEG events revealed a
very low incidence of sleep spindles and a normal number of K-complexes
over bilateral frontal and central EEG leads. In order to collect dream
reports, the patient was awakened three times over two nights following
at least 15 minutes of REM sleep in each case. On each occasion the patient
was not aware of any mental activity happening just prior to awakening.
These observations are discussed with regards to the connections that may
exist between EEG sleep spindle activity, selective attention, and the
capacity to generate a dream report.
Key Words: autism, rapid eye movements, sleep spindles, thalamus, Fahr's disease.
Mark W. Mahowald, M.D., Sharon R. Woods, M.D., and Carlos H. Schenck,
M.D.
Sleeping Dreams, Waking Hallucinations,
and the Central Nervous System
Dreaming: Journal of the Association for the Study of Dreams. Vol
8(2) 89-102, Jun 1998.
Abstract:
Consciousness is now considered a primary function and activity of
the brain itself. If so, consciousness is simply the brain's interpretation
and integration of all the information made available to it at any given
time. On the assumption that the brain is active across all states of being
(wakefulness, REM sleep, and NREM sleep), this article proposes that dreaming
and hallucinations represent variations on the same theme. Under usual
circumstances during wakefulness, the brain ignores internally generated
activity and attends to environmental sensory stimulation. During sleep,
dreaming occurs because the brain attends to endogenously generated activity.
In unusual settings, such as sleep-deprivation, sensory deprivation, or
medication or drug ingestion, the brain attends to exogenous and endogenous
activities simultaneously, resulting in hallucinations, or wakeful dreaming.
This concept is supported by numerous neurologic conditions and syndromes
that are associated with hallucinations.
Key Words: dreams, hallucinations, REM sleep, NREM sleep, consciousness
Michael Schredl
Dream Content in Patients with Narcolepsy:
Preliminary Findings
Dreaming: Journal of the Association for the Study of Dreams. Vol 8(2)
103-107, Jun 1998.
Abstract:
The present study investigated dream recall and dream content in patients
with narcolepsy. Compared to healthy controls, patients with narcolepsy
reported higher dream recall frequency and more negatively toned and bizarre
dreams, confirming earlier findings.
Key Words: narcolepsy, bizarreness
Aaron Rochlen, B.A., Robert Hoffmann, Ph.D. and Roseanne Armitage,
Ph.D.
EEG Correlates of Dream Recall in Depressed
Outpatients and Healthy Controls
Dreaming: Journal of the Association for the Study of Dreams. Vol 8(2)
109-123, Jun 1998.
Abstract:
The present study explored EEG correlates of dream recall in 17 symptomatic,
unmedicated depressed patients and in 19 healthy adults. EEG segments from
the last 30 minutes of sleep, from the five minutes following morning awakening,
and the absolute difference between sleep and waking EEG were contrasted
between the two groups of participants during successful dream recall and
during no recall. Period amplitude analysis was used to quantify EEG frequencies.
Increased high-frequency beta incidence in the right hemisphere and amplitude
in both hemispheres during sleep were associated with dream recall in both
patient and control groups. Depressed patients also showed higher delta
amplitude in both hemispheres during sleep associated with recall, but
this effect did not reach significance. With regard to the changes between
sleep and wakefulness, a smaller change in right hemisphere beta and delta
incidence characterized successful recall in healthy controls. By contrast,
those with depression showed recall success when the sleep/wake shifts
in right hemisphere beta and delta incidence were large. Recall failure
was characterized by small EEG shifts from sleep to wakefulness in the
depressed group. The same effects were observed for beta and delta amplitude
measures, except that healthy controls showed a large shift in delta amplitude
in the sleep-wake transition during successful recall but not during recall
failure. Recall in those with depression was associated with a dramatic
shift in left hemisphere delta amplitude. These findings provide support
for Koukkou and Lehmann's (1983, 1993) state-shift hypothesis of dream
recall in healthy controls (except for left hemisphere delta amplitude)
but not in the depressed. It appears that in order to recall a dream,
depressed patients must undergo larger shifts in brain activity and perhaps
a different pattern of reorganization of EEG frequencies than controls.
This finding may account for the low rates of recall reported previously
in this clinical group.
Key Words: EEG, dream recall, depression, sleep
Abstract:
Somatosensory stimulation of the leg muscles in REM sleep appears to
perturb virtual orientation in dream experiences. According to our model
of vestibulomotor adaptation (Sauvageau, Nielsen, & Montplaisir, 1996),
the dreaming mind attempts to compensate for such destabilizing stimulation
by increasing eye movement activity or by modifying dream content, among
other possible reactions. Effective compensation may be more easily achieved
by participants who are adapted to the disruptive stimulation or who possess
highly developed vestibulomotor skills. To examine this possibility, we
studied the effects of somatosensory stimulation on the dreams of 6 gymnasts
and 6 control participants aged 9 to 16 years. Results provide some support
for the expectations that 1) imposed somatosensory information is processed
by the central nervous system in REM sleep, 2) unilateral stimulation induces
an upset in virtual orientation, 3) gymnasts are more resistant to these
disruptive effects of stimulation than are control participants, and 4)
because of long-term adaptation, the dream content of gymnasts does not
differ markedly from that of controls. Though preliminary and in need of
replication, the findings are compatible with the notion that the developed
vestibular skills of gymnasts protects them to some extent from the effects
of a disruptive somatosensory stimulus during sleep.
Key Words: adaptation, somatosensory stimulation, REM sleep, dreams, eye movements
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