表題番号：2024C-551
日付：2025/03/31
研究課題報酬知覚に対する唾液中コルチゾール濃度を用いた測定方法の記述的検討
| 研究者所属（当時） | 資格 | 氏名 | |
|---|---|---|---|
| （代表者） | 人間科学学術院 人間科学部 | 教授 | 嶋田 洋徳 |
| （連携研究者） | 大学院人間科学研究科 | 大学院生 | 石川 律 |
- 研究成果概要
- Behavioral activation therapy, which is one form of psychological intervention for depression, has been shown to be effective in reducing depression (Ekers et al., 2014). Although behavioral activation therapy aims to change reward perception, it has been pointed out that the conventional self-administered questionnaire scale alone is not sufficient to capture the full range of reward perception (Janssen et al., 2021). Based on previous research, it was hypothesized that salivary cortisol concentration is one of the psychophysiological factors related to reward perception. However, there are no studies that have empirically examined the relationship between salivary cortisol and reward perception. Therefore, the purpose of this study was to describe the relationship between reward perception and salivary cortisol concentration in behavioral activation therapy.
The research participants were 38 university students and graduate students (average age 22.3 ± 4.5 years) from a university. Data analysis using indices of behavioral activation, reward perception, depression, and response area and amount of salivary cortisol concentration showed that there was an independent relationship between reward perception and response area and amount of salivary cortisol concentration (response area：r = −.163, p = .330, response amount：r = −.189, p = .257). Those with salivary cortisol concentrations greater than the median were classified as the high response group (n = 19), and those with concentrations lower than the median were classified as the low response group (n = 19). There was no relationship between reward perception and reaction amount in the high and low reaction amount groups (high reaction amount group：r = −.380, p = .109，low reaction amount group：r = −.098, p = .691). In addition, it was shown that only in the low response group, the relationship between behavioral activation and depression was mediated by reward perception (Z = −3.267, p = 001).
The results of this study suggest that there is no direct relationship between reward perception and salivary cortisol. On the other hand, it is suggested that the effectiveness of behavioral activation therapy may vary depending on the level of salivary cortisol, and further investigation is considered necessary in the future.