A, Laser light itself does not affect arousal probability (n = 6). ANOVA two-way repeated measures: interaction between laser and time, F(13,130) = 0.267, p = 0.9949; effect of time, F(13,130) = 98.8, p < 0.0001; effect of laser light, F(1,10) = 0.289, p = 0.6024. B, Laser light itself does not affect sighing probability (n = 6). ANOVA two-way repeated measures: interaction between laser and time, F(13,130) = 0.328, p = 0.9865; effect of time, F(13,130) = 114.4, p < 0.0001; effect of laser light, F(1,10) = 0.02, p = 0.8901.