One way to summarize the relationship between stress and performance is in terms of a letter "U" that has been inverted. Up to a certain point, increases in stress enhance performance. Beyond that point, further increases in stress impair performance.

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This is known as the Yerkes-Dodson law, which states that there is an optimal level of arousal (or stress) for performance, and that too little or too much arousal can have a negative impact.

One Way to Summarize the Relationship Between Stress and Performance