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===Facial expression===
Research studies<ref name="EkmanDavidson1993">{{cite journal|last1=Ekman|first1=Paul|last2=Davidson|first2=Richard J.|title=Voluntary Smiling Changes Regional Brain Activity|journal=Psychological Science|volume=4|issue=5|year=1993|pages=342–45|issn=0956-7976|doi=10.1111/j.1467-9280.1993.tb00576.x|s2cid=145733313}}</ref> indicate that voluntary [[Facial expression|facial expressions]], such as smiling, can produce effects on the body that are similar to those that result from the actual emotion, such as happiness. [[Paul Ekman]] and his colleagues studied facial expressions of emotions and linked specific emotions to the movement of corresponding facial muscles. Each basic emotion is associated with a distinctive facial expression, due to feedback from the expression that contributes to the emotional feeling. Ekman found that these expressions of emotion are universal and recognizable across widely divergent cultures.
=== Hormones ===
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