Optimal Arousal Theory

What is optimal arousal theory?

Optimal arousal theory is the idea that the level of activation most favorable for performance depends on the task and circumstances. It is often illustrated with an inverted-U curve, in which performance improves and then worsens as activation increases.

Here, arousal means psychological and physiological activation, such as alertness and bodily readiness to respond.

Arousal theory of motivation

The motivational version proposes that people seek stimulation when activation is too low and seek to reduce it when activation is too high. For example, someone might choose a challenging puzzle after an uneventful afternoon, then seek quiet after a demanding social event. This illustrates the proposal; it does not establish one ideal level for everyone. OpenStax discusses this account of motivation.

The Yerkes–Dodson law concerns arousal and task performance. It is commonly discussed alongside optimal arousal theory, but seeking stimulation and performing a task well are different questions.

Research foundation

The frequently cited Yerkes and Dodson study from 1908 tested electrical-stimulus intensity and brightness-discrimination learning in mice. More difficult discriminations favored weaker stimulation; the pattern differed in easier conditions. This was not a direct test of workplace stress or human anxiety.

Arousal, task difficulty, and individual differences

The curve is a hypothesis to test in a specified setting, rather than proof that every person has one stable, measurable arousal optimum. Task difficulty, the measure of activation, and the outcome being measured must be specified. For example, a claim that pressure helps a runner but hurts someone learning a difficult procedure would require evidence for those tasks; the curve alone cannot tell us.

Limits

The original study does not establish a universal inverted-U relationship across activities.