Sleep
September 1, 2009
Ursula Voss, R. Holzmann, Inka Tuin et al.
443 citations
Lucid dreaming combines hallucinatory dream activity with wake-like reflective awareness and control. Electrophysiological recordings from six trained student volunteers show that lucid dreaming shares REM-like power in delta and theta frequency bands but exhibits higher-than-REM activity in the gamma band, peaking around 40 Hz, especially in frontal and frontolateral regions. Overall brain coherence during lucid dreaming resembles waking levels and is significantly higher than in REM sleep across the analyzed spectrum; waking shows high alpha coherence, while lucid dreaming shows increased delta and theta coherence, largest in frontolateral and frontal areas. These findings suggest lucid dreaming is a hybrid state of consciousness with measurable physiological differences from both waking and REM sleep.
Journal of Sleep Research
May 29, 2012
Ursula Voss, Clemens Frenzel, Judith Koppehele-Gossel et al.
76 citations
Lucid dreaming is common in young children, with its incidence dropping around age 16. A survey of students aged 6-19 found that those in higher-level schools reported more lucid dreams than those in lower-level schools. The authors propose a link between the natural occurrence of lucid dreaming and brain maturation, considering methodological issues.
heiDOK (Heidelberg University)
January 1, 2009
Allan Hobson
61 citations
Advances in brain imaging and EEG recording have improved understanding of the neural basis of consciousness, but progress is limited by paradigms that often neglect subjective experience. Lucid dreaming, where dreamers are aware they are dreaming and can sometimes control the dream, offers a promising yet problematic paradigm for studying consciousness. Early results using lucid dreaming are encouraging and complementary, though preliminary. This paper evaluates the advantages and disadvantages of this approach and interprets recent findings.
heiDOK (Heidelberg University)
January 1, 2011
Allan Hobson, Michael Schredl
50 citations
A discussion between J. Allan Hobson and Michael Schredl examines unresolved questions in dream research, starting from the continuity hypothesis—that waking life is reflected in dreams—and Hobson's theory of protoconsciousness. The conversation centers on discontinuity: how dreams include activities the dreamer never experienced while awake. Possible functions of dreaming are debated, such as preparation for waking life or personal growth. The paper aims to stimulate further discussion among researchers on these fundamental topics for neurophysiological and psychological dream research.
January 1, 2015
Ursula Voss, Allan Hobson
27 citations
Lucid dreaming is the conscious awareness of dreaming while still in a dream state. This review examines evidence that lucid dreaming is a real phenomenon, including its occurrence, underlying mechanisms, and scientific value. Four hypotheses are presented: the Brain Maturation Hypothesis links brain development to lucid dream frequency in children and adults, suggesting spontaneous lucid dreams result from accidental frontal cortex activation during REM sleep. The Hybrid State Hypothesis and Space of Consciousness Model describe a wake-like EEG pattern in frontal brain areas alongside REM sleep-like EEG in posterior regions. The Gamma Band Hypothesis proposes that gamma oscillatory activity, which accompanies conscious awareness while awake, also promotes awareness in dreams. Experimental evidence suggests lower gamma band activity is necessary for conscious awareness in dreams.
Consciousness and Cognition
March 1, 2013
Ursula Voss, Karin Schermelleh-Engel, Jennifer Windt et al.
A new scale, the Lucidity and Consciousness in Dreams scale (LuCiD), distinguishes lucid from non-lucid dreams using eight factors: INSIGHT, CONTROL, THOUGHT, REALISM, MEMORY, DISSOCIATION, NEGATIVE EMOTION, and POSITIVE EMOTION. While all factors relate to dream consciousness, realism and negative emotion do not differ between lucid and non-lucid dreams, indicating that lucid insight is separate from dream bizarreness or changes in subjective realism. The scale was developed through exploratory factor analysis on data from a first survey and validated with confirmatory factor analysis on a second survey.
Advances in Consciousness Research
October 28, 2010
Allan Hobson, Ursula Voss
Consciousness in primates and humans has at least two expressions that depend on the state of the organism: waking and dreaming. In waking, consciousness allows volition and reflection (secondary consciousness), whereas dreaming is a state of primary consciousness characterized by delusional thoughts, though both states involve perception and emotion. Lucid dreaming is a rare, real condition that combines elements of both waking and dreaming, involving primary and secondary consciousness, and offers a promising tool for studying the neural basis of consciousness.
Consciousness and Cognition
December 1, 2007
Allan Hobson, David Kahn
Dream reports from normal subjects cannot reliably identify the individual dreamer. Judges asked to group dream reports by their authors performed at chance levels, indicating that dreams may share more common features than unique signatures. When personal identifiers such as names and gender of friends and family are removed, dream reports do not reveal the dreamer's identity. The findings suggest that beyond using dreams to understand individuals, they also reveal shared or generic aspects of human consciousness.