Individual differences in reactivity can be observed in how people encounter new stimuli; for instance, while one person might immediately respond to a new situation with high levels of anxiety, another person might barely notice the same stimuli.

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Reactivity, a key dimension of temperament, describes how an individual responds to novel or challenging stimuli in their environment. For instance, some individuals may react with high anxiety to new situations, while others may show little to no reaction.

Reactivity in Temperament

Spielman, R. M., Jenkins, W. J., & Lovett, M. D. (2020, April 22). Psychology (2nd ed.). OpenStax. https://openstax.org/books/psychology-2e/pages/1-introduction

OpenStax Psychology (2nd ed.) Textbook

A researcher presents a new, unfamiliar toy with flashing lights and sounds to a 9-month-old infant. The infant immediately begins to cry, turns their head away, and shows signs of distress. This infant's reaction to the novel object is the clearest example of which of the following?

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