Registered report: Validation of the PurpleXus sensor for skin temperature measurement

To understand whether and how temperature regulation contributes to interpersonal relationships, we need to study them on a daily basis. To do so, we need accurate sensors to measure frequently. In this study, we aim to validate the PurpleXus sensor for skin temperature measurement. It’s a newer, potentially more accurate, and less invasive thermal sensor than one we validated before, the ISP131001 (Sarda et al., 2021). We followed the same protocol as Sarda and colleagues (2021) and ran linear mixed models to check whether the PurpleXus sensor is reliably correlated to a wired and previously validated sensor, the MLT422/A probe. In addition, we provided formal comparisons between the PurpleXus sensor and the ISP131001 sensor. In the exploratory and the confirmatory set we found an overall correlation of .56 and [.xx] respectively between the PurpleXus and the MLT422/A probe, while we found a correlation of .42 and [.xx] between the ISP131001 and the MLT422/A probe. [We will add a discussion sentence after running the confirmatory analyses.]