During REM sleep, muscle paralysis takes place.
narcolepsy is just this paraysis (caused by the medula) at the wrong time
activity in the medula (INCREASES) muscle tone (DECREASES) = cataplexy
Siegel et al - looked at the activity in the medula in dogs during cataplexy. Activity was high.
this shows that there is a link between the lack of muscle tone in cataplaxy + the medula as in REM sleep
Schenkel + siegal - then destroyed the medulla in cats + they moved during REM as if awake.
This shows that muscle paralysis doesn't happen without the medulla making it the cause of cataplexy.
However not all people with narcolepsy have cataplexy!
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