Mean values and standard deviations (in parenthesis) of normative valence and arousal scores for the selected IAPS pictures.

Note. Scores range from 1 to 9. Independent samples t-test confirmed a highly significant difference in valence between neutral and unpleasant [t(119) = 29.34, pt(119) = −26.82, pt(119) = −52.58, pt(119) = −29.34, pt(119) = −30.98, pt(119) = −0.77, p = .441], confirming a balanced level of activation between these two emotion conditions.