Replication of the three sensitivity groups and investigation of their characteristics in Japanese samples

Sensory Processing Sensitivity (SPS) is a basic trait to describe individual differences in sensitivity and reactivity to environmental stimuli. Studies in Western countries have suggested that people fall into the three sensitivity groups, namely high-, medium-, and low-SPS groups and explored their characteristics. This study investigated whether the results found in Western studies can be replicated in Japanese samples. Two samples of Japanese university students, namely Sample A ( n = 1257) and Sample B ( n = 720), participated in a questionnaire-based survey. In both samples their SPS levels were assessed using the Japanese version of Highly Sensitive Person Scale. Additionally, only in Sample B their temperament and affect were assessed using the Japanese version of the Behavioral Inhibition System/Behavioral Activation System (BIS/BAS) scale and the Positive and Negative Affect Schedule. A series of latent class analysis indicated that the three-class model fitted best with the data. Each group could be interpreted as a high-, medium-, and low-SPS group, respectively. Furthermore, the characteristics of each group were explored considering the levels of BIS/BAS and positive and negative affect. Analyses of variance suggested that each sensitivity group in the Japanese samples had similar characteristics as those in Western samples. Although several issues should be addressed, most of the findings from Western studies could be replicated.