Fleeson (2002): it provides a test of the density distributions model of traits—specifi- cally, that a large part of the individual differences in traits is the frequency with which individuals enact corresponding states (e.g., the frequency of acting extraverted) and that within-person varia- tion in states is meaningful and at least somewhat isomorphic to variation in traits (Fleeson, 2001).
Fleeson, (2002): Together, these findings suggest the principle of state–trait isomorphism, that states share many properties and consequences with traits. If a trait is in large part the distribution of states, then consequences of the trait may follow when the state is enacted That is, if the trait comes into existence through enactment of relevant states, then consequences of the trait may also come into existence through enactment of relevant states. Thus, state–trait isomorphism predicts that the extraversion–positive affect rela- tionship previously revealed between persons may be characteris- tic of psychological functioning, that individuals’ highs and lows of happiness may be predictable from their highs and lows in extraversion states, that structural or slow-moving aspects of in- dividuals are not needed to explain the extraversion–positive affect relationship, and that one principle characterizing everyday navigation of the world is that more extraverted behavior brings with it more happiness than does more introverted behavior.
Andere onderzoeken onderbouwen isomorfisme in hun studie zo (dag en persoosnniveau significantie gevonden): Furthermore, we found the same relational patterns when investigating PVM on a general level and on a daily level, which suggests isomorphism and adds to the validity of our findings. The fact that we found PVM to be positively and sig- nificantly related to cognitive performance on an objective mea- sure is an additional strength of the present research.