| Abstract: | Ipsative behavioral variability is defined as change in the behavior of an individual in a constant environment. Through computer simulation of the dynamics of action (J. W. Atkinson and D. Birch; 1970, 1978), one may deduce that increases in ipsative variability in the expression of motivational imagery written in response to equally cued TAT pictures will increase the construct validity of that imagery regardless of the internal consistency reliability that remains. Empirical support for this hypothesis is offered by the finding that TAT need for achievement (nAch), measured in 4 stories written in response to weakly cued pictures, showed improved construct validity for 61 male undergraduates who were high rather than low in ipsative variability. TAT nAch showed significant construct validity for the high-variability group even though the internal consistency of this group's motive measure was –2.229. Findings disconfirm the general applicability of classical reliability theory to thematic apperceptive measures. (29 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved) |
