Before starting her day working at a day-care center, Meredith takes a few moments to smile at herself in the mirror. No matter how she is feeling before she comes in, she finds that smiling helps her feel happier before beginning her day. Meredith’s experience is evidence for

The James-Lange theory of emotions.

Explanation:

The James Lange theory of emotion was established by William James and Carl Lange in two separate reports that established the same conclusions. The theory states that emotions are experimental in response to a physiological change caused by an external event. That is, we first perceive something through our senses (for example, we see a snake), this generates a physiological response (sweating, increased heart rate) and then we perceive an emotion (fear).

In this case, because Meredith smiled in front of the mirror (physiological response), it generates the perception of joy during her day.

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