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SLEEP ANALYSIS AND A SIMPLE TECHNIQUE FOR SELECTIVE DEPRIVATION OF LOW‐VOLTAGE FAST‐WAVE SLEEP IN A SPECIES OF DEERMOUSE P. M. BAIRDI
Author(s) -
Mitler Merrill M.,
Levine Ralph
Publication year - 1970
Publication title -
psychophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.661
H-Index - 156
eISSN - 1469-8986
pISSN - 0048-5772
DOI - 10.1111/j.1469-8986.1970.tb02281.x
Subject(s) - psychology , audiology , arousal , sleep deprivation , electromyography , electrophysiology , sleep (system call) , slow wave sleep , electroencephalography , neuroscience , cognition , medicine , operating system , computer science
In Study I electrocorticographic (ECoG) and electromyographic (EMG) records were time‐sampled from each of 3 P. m. bairdi when motionless with eyes closed. Sixty intervals of 5 seconds each were categorized, by standard qualitative criteria, into three arousal states: Low‐voltage, fast‐wave sleep (LVF); High‐voltage, slowwave sleep (HVS); or Waking (W). Independently, each electrophysiological index was scored quantitatively either by counting large changes in ECoG potential or by rating intensity of EMG activity. Analyses indicated in general that the count and rating patterns were strongly associated with the initial qualitative judgments of arousal state, and in particular that low EMG activity was concomitant with LVF. It was hypothesized from these results and from the literature that LVF could be reduced by curtailing low levels of muscle tonus. Study II tested such an hypothesis with 3 more P. m. bairdi. Sixty 5‐second ECoG and EMG records were similarly sampled (when S 's eyes were closed), categorized, and independently quantified. Each S was perched over a shock‐grid on a pedestal too small to permit total loss of muscle tonus. These records showed only HVS and W but in ratios slightly altered from those observed for the first 3 animals. Comparing both studies suggested that, by preventing low muscle tonus, the pedestal‐over‐shock‐grid can radically reduce the proportion of LVF in the sleep of P. m. bairdi.