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The optimal level of anxiety more than 100 years ago, animal experimenters provided a clear demonstration

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of the link between emotion and motivation.

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They tested how quickly most learned a lap dance around also resulted in a shock of varying severity.

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The results showed that the lowest levels of shock led to a relatively slow learning as the mice seemed

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insufficiently motivated by mild punishment.

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The highest levels of shock similarly produced the slow learning as the mice seem to have reached a

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heightened state of arousal that interfered with learning.

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Psychologists call this button an inverted you because of the shape it makes when ground humans show

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the same inverted U.

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Button as a function of their anxiety.

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Too little and too much hurt.

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Our performance and modest amounts maximize our success.

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For example, moderate amounts of stimulants stimulants like coffee can increase our energy and focus

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while higher amounts make us feel jittery and overstimulated.