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2017 ; 2017
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Microdream neurophenomenology
#MMPMID30042836
Nielsen T
Neurosci Conscious
2017[]; 2017
(1
): nix001
PMID30042836
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Nightly transitions into sleep are usually uneventful and transpire in the blink
of an eye. But in the laboratory these transitions afford a unique view of how
experience is transformed from the perceptually grounded consciousness of
wakefulness to the hallucinatory simulations of dreaming. The present review
considers imagery in the sleep-onset transition-"microdreams" in particular-as an
alternative object of study to dreaming as traditionally studied in the sleep
lab. A focus on microdream phenomenology has thus far proven fruitful in
preliminary efforts to (i) develop a classification for dreaming's core
phenomenology (the "oneiragogic spectrum"), (ii) establish a structure for
assessing dreaming's multiple memory inputs ("multi-temporal memory sources"),
(iii) further Silberer's project for classifying sleep-onset images in relation
to waking cognition by revealing two new imagery types ("autosensory imagery,"
"exosensory imagery"), and (iv) embed a potential understanding of microdreaming
processes in a larger explanatory framework ("multisensory integration
approach"). Such efforts may help resolve outstanding questions about dream
neurophysiology and dreaming's role in memory consolidation during sleep but may
also advance discovery in the neuroscience of consciousness more broadly.
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