An integrating and dynamic model of personality that allows predicting the
response of the basic factors of personality, such as the Big Five Factors (B5F)
or the general factor of personality (GFP) to acute doses of drug is presented
in this paper. Personality has a dynamic nature, i.e., as a consequence of a
stimulus, the GFP dynamics as well as each one of the B5F of personality
dynamics can be explained by the same model (a system of three coupled
differential equations). From this invariance hypothesis, a partial differential
equation, whose solution relates the GFP with each one of the B5F, is deduced.
From this dynamic approach, a co-evolution of the GFP and each one of the B5F
occurs, rather than an unconnected evolution, as a consequence of the same
stimulus. The hypotheses and deductions are validated through an experimental
design centered on the individual, where caffeine is the considered stimulus.
Thus, as much from a theoretical point of view as from an applied one, the
models here proposed open a new perspective in the understanding and study of
personality like a global system that interacts intimately with the environment,
being a clear bet for the high level inter-disciplinary research.