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. 2008 Apr 2;28(14):3535–3545. doi: 10.1523/JNEUROSCI.5023-07.2008

Figure 2.

Figure 2.

There is an endogenous glycinergic drive at the trigeminal motor pool in waking and NREM sleep, but not during tonic REM sleep. A, Raw EMG and EEG traces from one rat showing that strychnine perfusion into the left trigeminal motor pool increased left masseter muscle (LM) tone during waking and NREM sleep; this intervention did not affect the atonia of tonic REM sleep. However, it did increase the left masseter muscle twitch amplitude during phasic REM. B, Group data (n = 11) demonstrating that strychnine increased LM tone in QW and NREM sleep, without changing levels of motor tone during tonic REM sleep. Although this intervention consistently increased LM tone in AW, it was not statistically significant. C, Group data (n = 101 REM periods) demonstrating that strychnine perfusion into the left trigeminal motor pool increased left masseter muscle twitch amplitude during phasic REM sleep, without significantly effecting either muscle twitch frequency or duration. *p < 0.05. A.U., Arbitrary units; #/s, number muscle twitches per second. All values are mean ± SEM.