The purpose of this study was to explore adaptation through the manipulation of perceived task difficulty and self-efficacy to challenge the concepts postulated by the two-perception probabilistic concept of the adaptation phenomenon (TPPCA) conceptual framework. Twenty-four randomized performers completed a handgrip and putting task, at three difficulty levels, to assess their self-efficacy and perceived task difficulty interactions on motivations, affect, and performances. The TPPCA was partially confirmed in both tasks. Specifically, as the task difficulty level increased, arousal increased, pleasantness decreased, and the performance declined. There was no solid support that motivational adaptations were congruent with the TPPCA. The findings pertaining to the human adaptation state represent a first step in encouraging future inquiries in this domain. The findings clarify the notion of perceived task difficulty and self-efficacy discrepancy, which then provokes cognitive appraisals and emotional resources to produce an adaptation response.