Fig 3. Frequency of scraping events directed towards both cheeks.

Bar-graphs showing the frequency of the scraping events (SCRA) that each subject directed towards both sides of their face (see S1 Fig) across the four different conditions when the colored mark was positioned on the left cheek (a) (CM, OM, SHAM, MARK 1; df = 3; Julia: χ² = 137.05, p < 0.0001; Calippo: χ² = 5.27, p = 0.1531; Gina: χ² = 58.61, p < 0.0001; Betsie: χ² = 34.68, p < 0.0001) and when it was placed on the right cheek (b) (CM, OM, SHAM, MARK 2; df = 3; Julia: χ² = 27, p < 0.0001; Calippo: χ² = 10.62, p = 0.014; Gina: χ² = 28.85, p < 0.0001; Betsie: χ² = 42, p < 0.0001).