Communication via warm haptic interfaces does not increase social warmth

Affective haptic interfaces are designed to influence one's emotional and physiological state via the sense of touch, and may be applied as communication media to increase the sense of closeness. Recent research suggests that stimulation with physical warmth can enhance this interpersonal closeness: a physical-social warmth link. It is often suggested that this link may be particularly suitable for application in affective haptic interfaces, but the scientific evidence is inconclusive. In this work we investigated whether adding physical warmth to a communication mediuman interactive teddy bear could increase social connectedness between remotely located interactants and could provide physiological comfort during stressful circumstances. Moreover, we investigated whether the warmth could best be presented to the users as a mere physical attribute of the medium or as mediated body heat; thereby manipulating the attribution of the warmth to either a non-social or social source. The results of two studies in which participants ostensibly received a message from an unknown other (Study 1,