Neurophysiology of spontaneous facial expressions: II. Motor control of the right and left face is partially independent in adults
| Autor: | Thomas L. Holden, Asif M. Adnan, Elliott D. Ross, Joseph P. Havlicek, Smita S. Gupta, Sridhar Radhakrishnan |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Adult
Male Adolescent Cognitive Neuroscience Emotions Lower face Experimental and Cognitive Psychology Functional Laterality 050105 experimental psychology Lateralization of brain function Young Adult 03 medical and health sciences 0302 clinical medicine Cortex (anatomy) medicine Humans 0501 psychology and cognitive sciences Facial expression Motor area 05 social sciences Motor Cortex Motor control Neurophysiology Facial Expression stomatognathic diseases Neuropsychology and Physiological Psychology medicine.anatomical_structure Face Face (geometry) Female Psychology Neuroscience 030217 neurology & neurosurgery |
| Zdroj: | Cortex. 111:164-182 |
| ISSN: | 0010-9452 |
| DOI: | 10.1016/j.cortex.2018.10.027 |
| Popis: | Facial expressions are described traditionally as monolithic or unitary entities. However, humans have the capacity to produce facial blends of emotion in which the upper and lower face simultaneously display different expressions. Recent neuroanatomical studies in monkeys have demonstrated that there are separate cortical motor areas for controlling the upper and lower face in each hemisphere that, presumably, also occur in humans. Using high-speed videography, we began measuring the movement dynamics of spontaneous facial expressions, including facial blends, to develop a more complete understanding of the neurophysiology underlying facial expressions. In our part 1 publication in Cortex (2016), we found that hemispheric motor control of the upper and lower face is overwhelmingly independent; 242 (99%) of the expressions were classified as demonstrating independent hemispheric motor control whereas only 3 (1%) were classified as demonstrating dependent hemispheric motor control. In this companion paper (part 2), 251 unitary facial expressions that occurred on either the upper or lower face were analyzed. 164 (65%) expressions demonstrated dependent hemispheric motor control whereas 87 (35%) expressions demonstrated independent or dual hemispheric motor control, indicating that some expressions represent facial blends of emotion that occur across the vertical facial axis. These findings also support the concepts that 1) spontaneous facial expressions are organized predominantly across the horizontal facial axis and secondarily across the vertical facial axis and 2) facial expressions are complex, multi-component, motoric events. Based on the Emotion-type hypothesis of cerebral lateralization, we propose that facial expressions modulated by a primary-emotional response to an environmental event are initiated by the right hemisphere on the left side of the face whereas facial expressions modulated by a social-emotional response to an environmental event are initiated by the left hemisphere on the right side of the face. |
| Databáze: | OpenAIRE |
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