Basic psychological need satisfaction, need frustration, and need strength across four cultures

The present study investigated whether satis- faction and frustration of the psychological needs for autonomy, relatedness, and competence, as identified within Basic Psychological Need Theory (BPNT; Deci and Ryan, Psychol Inquiry 11:227-268, 2000; Ryan and Deci, Psychol Inquiry 11:319-338, 2000), contributes to participants' well-being and ill-being, regardless of their cultural back- ground and interpersonal differences in need strength, as indexed by either need valuation (i.e., the stated importance of the need to the person) or need desire (i.e., the desire to get a need met). In Study 1, involving late adolescents from Belgium and China (total N = 685; Mean age = 17 years), autonomy and competence satisfaction had unique associations with well-being and individual differences in need valuation did not moderate these associations. Study 2 involved participants from four culturally diverse nations (Belgium, China, USA, and Peru; total N = 1,051; Mean age = 20 years). Results provided evidence for the mea- surement equivalence of an adapted scale tapping into both need satisfaction and need frustration. Satisfaction of each of the three needs was found to contribute uniquely to the prediction of well-being, whereas frustration of each of the three needs contributed uniquely to the prediction of ill- being. Consistent with Study 1, the effects of need satis- faction and need frustration were found to be equivalent across the four countries and were not moderated by indi- vidual differences in the desire for need satisfaction. These findings underscore BPNT's universality claim, which states that the satisfaction of basic needs for autonomy, relatedness, and competence represent essential nutrients for optimal functioning across cultures and across individ- ual differences in need strength.