Which of the following describes the Yerkes-Dodson law? An individual’s belief in his own capabilities or capacities to complete a task influences his ability to complete the task. Deviations from homeostasis create physiological needs that result in psychological drive states that direct behavior to meet the need and ultimately bring the system back to homeostasis. Humans experience a spectrum of needs ranging from basic biological needs to social needs to self-actualization. Simple tasks are performed best when arousal levels are relatively high, yet complex tasks are performed best when arousal levels are low.