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In humans, the happy facial expression is a pivotal reward cue.
Positive social cues, like happy facial expressions, activate the brain's reward system and indicate interest in social affiliation.
In fact, they found, a happy facial expression appeared to compensate for relative unattractiveness.
During each session, functional brain images centered about the amygdala were acquired continuously while participants were shown alternating blocks of fearful, neutral and happy facial expressions.
Moreover, under OT treatment, eye gaze remained increased when the face showed a happy facial expression, but in contrast decreased when the face displayed an angry expression.
Happy facial expressions activate the brain's reward system and are disregarded by subjects scoring high on depressive mood who are low in reward drive.
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For example, for happiness-surprise, facial images of happy and surprised expressions were morphed to create a series of pictures ranging across five ratios (90%–10%, 70%–30%, 50%–50%, 30%70%%, and 10%90%%).
Happy and exuberant facial expressions served as positive social reinforcers, while neutral facial expressions were shown after false alarms (for validation of face stimuli, see [ 9]).
AVP did not affect attention toward, nor autonomic arousal in response to, emotionally neutral, happy or angry facial expressions, but it did selectively enhance the corrugator EMG responses evoked by emotionally neutral facial expressions, making them similar in magnitude to responses evoked by angry facial expressions in control subjects.
On each day, their spontaneous gaze behavior was recorded using eye-tracking, while they looked at angry, happy, and neutral facial expressions.
This study was designed to investigate the relationship between basal levels of salivary cortisol, self-reported mood and spatial memory for neutral, happy and angry facial expressions in healthy young volunteers (N=31).
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