Environmental Sensitivity in Adults: Psychometric Properties of the Japanese Version of the Highly Sensitive Person Scale 10-Item Version

Environmental Sensitivity, which explains individual differences in the tendency to respond more to both positive and negative environmental influences, can be measured by the self-reported Highly Sensitive Person scale. This paper introduced psychometric properties of a brief Japanese version of a 10-item measure of sensitivity (HSP-J10) developed by four studies involving 2,388 adults. The results showed that (1) the newly created HSP-J10 supported the bifactor structure (i.e., Ease of Excitation, Low Sensory Threshold, Esthetic Sensitivity, plus General Sensitivity factor), (2) the HSP-J10 correlated with but discriminated against other personality traits and affects, (3) it had high temporal stability, and (4) participants who scored higher on the HSP-J10 showed significant increases in positive emotion from before watching a video with positive content to after, while those who scored low showed no significant change in positive emotion. It demonstrated the new scale's good psychometric properties in that it moderated outcomes as theoretically expected when the environment was experimentally manipulated. The four studies suggested that the newly created HSP-J10 might adequately measure individual differences in adults' Environmental Sensitivity.