pedunculopontine tegmental nucleus Animals 22 Arousal 18 Pedunculopontine Tegmental Nucleus 18 animal 18 calcium channel N type 18 human 18 physiology 18 REM sleep 16 nonhuman 16 rat 16 Neurons 14 Rats 14 Rats, Sprague-Dawley 14 calcium channel P type 14 calcium channel Q type 14 gamma rhythm 14 Calcium channels 12 arousal 12 calcium channel 12 membrane potential 12 nerve cell 12 priority journal 12 wakefulness 12 P/Q-type 10 Sprague Dawley rat 10 article 10 controlled study 10 neuronal calcium sensor 10 schizophrenia 10