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Carbachol microinjection into the caudal peribrachial area induces long‐term enhancement of PGO wave activity but not REM sleep
Author(s) -
Quattrochi James J.,
Hobson J. Allan
Publication year - 1999
Publication title -
journal of sleep research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.297
H-Index - 117
eISSN - 1365-2869
pISSN - 0962-1105
DOI - 10.1046/j.1365-2869.1999.00173.x
Subject(s) - carbachol , microinjection , cholinergic , slow wave sleep , sleep (system call) , rapid eye movement sleep , endocrinology , chemistry , medicine , neuroscience , psychology , eye movement , electroencephalography , stimulation , computer science , operating system
Summary This study presents new findings of carbachol‐induced long‐term ponto‐geniculo‐occipital (PGO) enhancement lasting five days, but without REM sleep enhancement. A quantitative analysis of the number and types of bilateral PGO wave events during slow wave sleep with PGO activity (SP) and REM was performed in each of four cats over a period of six days following a single unilateral microinjection of carbachol nanospheres into the caudolateral peribrachial area. The results demonstrate increases in the summed total of all PGO wave events to continue for five days postcarbachol reaching a peak sixfold increase on day three in SP and REM. The tendency of PGO waves to occur in clusters of greater than three waves increased sevenfold on day three in SP and fourfold during REM. These findings indicate a dissociation of long‐term PGO enhancement from long‐term REM enhancement, and suggest that even a sixfold increase in PGO activity alone is not, in itself, sufficient to produce the cholinergic orchestration of REM sleep enhancement.