David Bourget (Western Ontario)
David Chalmers (ANU, NYU)
Rafael De Clercq
Jack Alan Reynolds
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Behavioral and Brain Sciences 23 (6):843-850 (2000)
The paradigmatic assumption that REM sleep is the physiological equivalent of dreaming is in need of fundamental revision. A mounting body of evidence suggests that dreaming and REM sleep are dissociable states, and that dreaming is controlled by forebrain mechanisms. Recent neuropsychological, radiological, and pharmacological findings suggest that the cholinergic brain stem mechanisms that control the REM state can only generate the psychological phenomena of dreaming through the mediation of a second, probably dopaminergic, forebrain mechanism. The latter mechanism (and thus dreaming itself) can also be activated by a variety of nonREM triggers. Dreaming can be manipulated by dopamine agonists and antagonists with no concomitant change in REM frequency, duration, and density. Dreaming can also be induced by focal forebrain stimulation and by complex partial (forebrain) seizures during nonREM sleep, when the involvement of brainstem REM mechanisms is precluded. Likewise, dreaming is obliterated by focal lesions along a specific (probably dopaminergic) forebrain pathway, and these lesions do not have any appreciable effects on REM frequency, duration, and density. These findings suggest that the forebrain mechanism in question is the final common path to dreaming and that the brainstem oscillator that controls the REM state is just one of the many arousal triggers that can activate this forebrain mechanism. The “REM-on” mechanism (like its various NREM equivalents) therefore stands outside the dream process itself, which is mediated by an independent, forebrain “dream-on” mechanism. Key Words: acetylcholine; brainstem; dopamine; dreaming; forebrain; NREM; REM; sleep.
|Keywords||acetylcholine brainstem dopamine dreaming forebrain NREM REM sleep|
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Nadav Matalon (2011). The Riddle of Dreams. Philosophical Psychology 24 (4):517 - 536.
Tracey L. Kahan & Stephen P. LaBerge (2011). Dreaming and Waking: Similarities and Differences Revisited. Consciousness and Cognition 20 (3):494-514.
Jennifer M. Windt & Valdas Noreika (2011). How to Integrate Dreaming Into a General Theory of Consciousness—A Critical Review of Existing Positions and Suggestions for Future Research. Consciousness and Cognition 20 (4):1091-1107.
J. Allan Hobson (2002). Sleep and Dream Suppression Following a Lateral Medullary Infarct: A First-Person Account. Consciousness and Cognition 11 (3):377-390.
Sue Llewellyn (2011). If Waking and Dreaming Consciousness Became de-Differentiated, Would Schizophrenia Result? Consciousness and Cognition 20 (4):1059-1083.
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