Mind at ease puts a smile on the face: psychophysiological evidence that processing facilitation elicits positive affect.

@article{Winkielman2001MindAE,
  title={Mind at ease puts a smile on the face: psychophysiological evidence that processing facilitation elicits positive affect.},
  author={Piotr Winkielman and John T. Cacioppo},
  journal={Journal of personality and social psychology},
  year={2001},
  volume={81 6},
  pages={
          989-1000
        }
}
The affect system, in its position to monitor organismic-environmental transactions, may be sensitive to the internal dynamics of information processing. Hence, the authors predicted that facilitation of stimulus processing should elicit a brief, mild, positive affective response. In 2 studies, participants watched a series of neutral pictures while the processing ease was unobtrusively manipulated. Affective reactions were assessed with facial electromyography (EMG). In both studies, easy-to… 

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