Arousal is the level of physiological and psychological activation experienced by a performer, ranging from deep sleep to intense excitement. Performance generally improves as arousal rises toward an optimal level, but excessive or insufficient arousal can reduce performance.
How arousal affects performance
Arousal activates the sympathetic nervous system, increasing heart rate, breathing rate, alertness and muscle readiness. Moderate activation can improve concentration, reaction time and motivation, whereas over-arousal may cause muscle tension, rushed decisions and a narrowed attentional field.
The inverted-U hypothesis proposes that performance increases with arousal until an optimal arousal level is reached. Beyond this point, further arousal causes performance to decline. However, the optimal level differs according to the performer and task.
| Factor | Lower optimal arousal | Higher optimal arousal |
|---|---|---|
| Task demands | Complex, precise or fine-motor tasks, such as archery | Simple, gross-motor or power tasks, such as weightlifting |
| Skill level | Novices, because they must consciously process more information | Experts, because skills are more automatic |
| Personality | Introverts, who may reach over-arousal sooner | Extroverts, who may tolerate greater stimulation |
The individual zone of optimal functioning develops this idea by suggesting that each athlete has a personal range of arousal within which performance is most likely to be successful. This explains why two athletes performing the same activity may require different pre-performance routines.
Arousal must also be distinguished from anxiety. Arousal is neutral activation, whereas anxiety is a negative emotional response involving apprehension and may include cognitive worry and somatic symptoms. The common misconception that more arousal always improves performance is therefore incorrect.
Exam technique
For IB SEHS subtopic C.4.1, define arousal, explain the inverted-U relationship, and apply it to a named sporting example. For an “explain” question, link the athlete’s arousal level to a specific mechanism and performance outcome rather than merely stating that performance improves or declines.
