Reference:
SAM - the Self-assessment Manikin (Bradley, M. M, Lang, P. J.: Measuring emotion: the Self-Assessment Manikin and the Semantic Differential. [J]. Journal of Behavior Therapy & Experimental Psychiatry 25(1), 49 (1994).)
FPD - the Foot pressure distribution (Hessert M J, Vyas M, Leach J, et al. Foot pressure distribution during walking in young and old adults[J]. Bmc Geriatrics, 2005, 5(1):8.)