Psychological need theories offer much explanatory potential for behavioral scientists, but there is considerable disagreement and confusion about what needs are and how they work. A 2-process model of psychological needs is outlined, viewing needs as evolved functional systems that provide both (a) innate psychosocial motives that tend to impel adaptive behavior and (b) innate experiential requirements that when met reinforce adaptive behavior and promote mental health. The literature is reviewed to find support for 8 hypotheses derived from this model: that certain basic psychosocial motives are present at birth; that successful enactment of these motives supports the functioning and wellness of all humans; that individual differences in these motives develop in childhood; that these strong motive dispositions tend to produce the satisfying experiences they seek; that motive dispositions do not moderate the effect of motive-corresponding need satisfaction on well-being but do moderate the effect of assigned goal-type on rated self-concordance for those goals; that need dissatisfaction and need satisfaction correspond to the separable behavioral-motive and experiential-reward aspects of needs; and that motives and needs can become decoupled when chronic dissatisfaction of particular requirements warps or depresses the corresponding motives, such that the adaptive process fails in its function. Implications for self-determination theory and motive disposition theory are considered.
© 2011 American Psychological Association