optimal arousal

Meaning: Arousal is the level of alertness and activation of the body and brain, such as heart rate, wakefulness and attention. Arousal theory of motivation proposes that people act to keep arousal near a preferred level. They seek stimulation when bored (arousal too low) and avoid it when overwhelmed (arousal too high). The Yerkes-Dodson law links arousal to performance. Too little arousal means low alertness and weak performance. Too much arousal impairs performance, in part through anxiety and narrowed attention.

On the MCAT: A passage usually gives an inverted U graph with arousal on the x-axis and performance on the y-axis, often with separate curves for easy and hard tasks. You predict where the peak falls. For a difficult or unfamiliar task, such as a complex problem, the peak sits at lower to moderate arousal. For a simple or well-learned task, such as a routine motor skill, the peak sits at higher arousal. Questions may also ask why a sensation seeker, who tends to prefer a higher level of stimulation, behaves differently from someone who prefers a lower level.

Common confusion: Optimal does not mean maximal. Performance does not keep improving as arousal rises. The optimal point is also not one fixed value, since it shifts with task difficulty and with the person. Do not confuse arousal theory with drive reduction theory, which says behavior reduces tension from unmet biological needs rather than seeking an ideal level of stimulation.