> Social thermoregulation can be seen as a motivating force that enables organisms to regulate and buffer body temperature by modifying their proximity with others. This study aims at exploring the amount of Brown Adipose Tissus (BAT) in relation to social thermoregulation and more precisely, to individual self-reported questionnaires meant to assess various aspects of the personality (mainly interpersonal attachments and sensitivity to temperature changes). To provide support for the hypothesis “BAT activity relates to individual results of the questionnaires, especially attachment” (see [the rationale of the study][1]), we first assess BAT through the measure of infrared thermography around the subclavicular area. Then we evaluate with a Bayesian sequential analysis (BSA) the evidence of its correlation with the items of the questionnaires (for instance anxiety, avoidance, loneliness, for more see the [methods, procedure and scales][2]). The results of such a method will provide substantial evidence for the null hypothesis or the alternative hypothesis mentioned above. Moreover, when the BSA upholds one of the hypothesis, we will run a conditional random forest (CRF). This method compares the relative importance of the different items and identifies the ones which best predict BAT activity (see [Analyses][3]). If the sample size required by the BSA is smaller than a defined threshold, we will try to replicate the results by conducting the assessment of BAT with a new sample. If the sample size required by the BSA is larger than the threshold, we will do a split-half approach and a cross validation of the CRF model. Overall, the results could provide a more global understanding of how BAT activity relates to personality traits and social behaviors. [1]: https://osf.io/7vztx/wiki/home/ [2]: https://osf.io/43yqc/wiki/home/ [3]: https://osf.io/n7ytq/wiki/home/