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. 2010 Oct 4;107(42):18155–18160. doi: 10.1073/pnas.1012764107

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Fig. 4. — Arousal response to stimuli during sleep. (A) (Left) During REM sleep, Gscl^−/− mice (n = 4) tended to be awakened in response to acoustic stimuli, but Gscl^+/+ mice (n = 5) remained asleep (χ² test; P < 0.001). (Right) There was no significant difference between Gscl^−/− mice and Gscl^+/+ mice in the arousal response to an approaching object during NREM sleep (P = 0.2). Numbers in the table denote the number of stimulus trials. (B) The latency of Gscl^−/− mice (n = 4) in response to an approaching object during REM sleep was shorter than that of Gscl^+/+ mice (n = 5) (Mann–Whitney's u test, P < 0.001). Circles represent individual trials.