Inducing Forward Head Posture Recalibrates the Valuation of Future Rewards.

BACKGROUND: The ability to prioritize long-term goals over immediate rewards is a cornerstone of human self-regulation and life-course success. Emerging evidence suggests that axial postural orientation provides a continuous stream of proprioceptive feedback that modulates this temporal valuation process. Using the framework of grounded cognition, this study investigated whether inducing Forward Head Posture (FHP) influences the valuation processes underlying self-regulation and future-oriented choice. METHODS: Healthy young adults (N=59) performed a Delay Discounting Task (DDT) and a control simple reaction time (SRT) task in one of two conditions: FHP or Neutral Head Posture (NHP). Choice behavior was modeled using Generalized Linear Mixed Models (GLMM) to isolate shifts in reward-valuation probability. RESULTS: Participants in the FHP condition showed a significantly higher probability of choosing smaller-sooner rewards compared to the NHP group (p=.004). The groups did not differ on SRT latency (p=.82), indicating that the FHP effect reflects a selective shift in executive decision-making rather than a general decline in processing capacity. CONCLUSION: These findings provide experimental evidence that the head-neck-torso relationship is a relevant variable in the functional architecture of self-regulation. Transient FHP appears to shift the organism toward an immediacy-biased state, suggesting that postural orientation is an integral component of the physiological processes that influence executive function. This has direct implications for neurorehabilitation and the study of behavioral self-control.