Poster E93, Monday, March 26, 2:30-4:30 pm, Exhibit Hall C
Association between Unintentional Interpersonal Postural Coordination Produced by Interpersonal Light Touch and the Intensity of Social Relationship
Tomoya Ishigaki1,2,3, Ryota Imai1, Shu Morioka1; 1Kio University, 2Fit-care Home-visit Nursing Station, 3Higashiikoma Hospital
Interpersonal postural coordination (IPC) produced by interpersonal light touch (ILT), whereby time series variations in the postural sway between two people unconsciously resemble each other, is a possible social interaction. From a social sociopsychologial standpoint, close mutual behavioral coordination is recognized as “social glue,” which represents the closeness of relationships and contributes to build good rapport. Therefore, if IPC functions as social glue, we hypothesized that IPC produced by ILT also represents a social relationship. To examine this hypothesis, we recruited dyad participants with a preexisting social relationship and assessed the closeness toward the partner as rapport. Postural sway in two quiet standing conditions, no touch (NT) and ILT (a mutual slight touch with <1 N) conditions, were measured concurrently, and the association of IPC with intradyadic closeness was analyzed using hierarchical linear modeling. As a result, higher IPC was observed in both axes of the ILT condition than that in the NT condition. Additionally, IPC in the mediolateral axis of the ILT condition was positively correlated with intradyadic closeness, while that in the anteroposterior axis showed a negative association. As expected, IPC represented intradyadic closeness; hence, intradyadic closeness may function as a gain controller for modulating the degree of sensory information processing of the partner’s and own postural control (i.e., good closeness increases gain to receive partner feedback). We conclude that unintentional IPC produced by ILT functions as social glue, and it provides an understanding of the sociopsychological aspect in the human-to-human postural coordination mechanism.
Topic Area: PERCEPTION & ACTION: Motor control