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. 2014 Aug 5;9(8):e104381. doi: 10.1371/journal.pone.0104381

Table 1. Mean (and standard deviation) of pleasantness and arousal ratings elicited by pain, happy and neutral faces.

Pleasantness Arousal
Pain 2.75 (1.1) 5.47 (2.7)
Neutral 4.60 (1.3) 4.05 (2.4)
Happy 7.57 (1.4) 5.02 (2.5)

Pleasantness ratings ranged from 1 (very unpleasant) to 9 (very pleasant), and arousal ratings range from 1 (very calm) to 9 (very excited).