Skin conductance responses aligned to trial end (t = 0). The gray zone indicates the temporal window considered for analysis. A, Responses for the four experimental conditions. B, Temporal evolution of arousal and valence effects. The effect of arousal was statistically significant (red “A”), but no effect of valence was detected (black “V”). Colored bars above plots indicate trial timing: play period (black), indication period (yellow), and blank screen (blue; variable length).