Lateralization facial expressions

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Skip to search form Skip to main content. Evidence is largely based on studies with static stimuli focusing on the fusiform face area FFA. Hence, the pattern of lateralization for dynamic faces is less clear.

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Facial electromyography EMG was recorded from left and right zygomatic and corrugator muscle regions in response to reflective questions and during voluntary facial expressions. Both muscle regions showed consistent responses to five emotions happiness, excitement, neutral, sadness, and fear evoked in the involuntary condition i. Lateralized responses were found for the zygomatic muscle in the involuntary condition: positive emotion questions elicited relatively greater right muscle activity than left muscle activity, while negative emotion questions elicited relatively greater left muscle activity than right muscle activity.

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Sensitivity to the emotions of others provides clear biological advantages. However, in the case of heterospecific relationships, such as that existing between dogs and humans, there are additional challenges since some elements of the expression of emotions are species-specific. Given that faces provide important visual cues for communicating emotional state in both humans and dogs, and that processing of emotions is subject to brain lateralisation, we investigated lateral gaze bias in adult dogs when presented with pictures of expressive human and dog faces. Our analysis revealed clear differences in laterality of eye movements in dogs towards conspecific faces according to the emotional valence of the expressions.

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This work is licensed under a Creative Commons Attribution 4. Skip to main content Skip to main navigation menu Skip to site footer. Keywords: visual screening, facial expression, eye tracking, gender, age, lateralization.

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There are three major hypotheses regarding the lateralization of emotion in the brain—the right-hemisphere hypothesis RHHthe valence hypothesis, and the approach-withdrawal hypothesis. The approach-withdrawal hypothesis, which is the most widely accepted, states that emotions that elicit approach behaviors are lateralized to the left hemisphere, while emotions that elicit withdrawal behaviors are lateralized to the right hemisphere. In line with this hypothesis, it has been found that persons with depression show left frontal hypoactivity and right frontal hyperactivity. This hemispheric asymmetry appears not to influence mood but rather emotional reactions to affective stimuli.

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