The conjecture was investigated that the intellective load carrying capability for selected intellective functions is identifiable and measurable. Intellective load carrying failure was defined as the point at which a change in transfer function components occurs as a tracking and a scaled intellective function were concomitantly performed. The scaled intellective functions were drawn from the Guilford Structure-of-Intellect model. The transfer function components included amplitude ratio and phase lag as defined by the frequency-response analytic method. Anticipated differences between individual and between intellective function were found. The ability to isolate the intellective load carrying threshold for individual subjects and for individual intellective functions was demonstrated. (Author)