Arousal nonhuman 26 Animals 24 priority journal 24 Rats 20 article 20 rat 20 Rats, Sprague-Dawley 18 pedunculopontine tegmental nucleus 18 animal experiment 16 controlled study 16 Neurons 14 animal 14 gamma rhythm 14 Pedunculopontine Tegmental Nucleus 12 REM sleep 12 calcium channel N type 12 physiology 12 Male 10 P/Q-type 10 animal tissue 10 arousal 10 calcium channel P type 10 calcium channel Q type 10 nerve cell 10 Animal 8 Brachyura 8 Calcium Channels, N-Type 8 Escape Reaction 8 Gamma oscillations 8