How the brain controls facial expressions

In light of these findings, it is not surprising that electrical stimulation of the amygdala, and seizures originating therein, cause facial movements in both humans and monkeys Baldwin et al. The pia, which covers the entire surface of the brain, follows the folds of the brain. Cerebral and cerebellar gray matter reduction in first-episode patients with major depressive disorder: It helps one maintain posture, sense of balance or equilibrium, by controlling the tone of muscles and the position of limbs. The participants provided written informed consent after detailed description of the study.
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Say “cheese” with your left hemisphere but smile at a friend with your right

The output of the amygdala might influence the choice of facial expressions because it signals the identity, facial expression, and gaze direction of others Leonard et al. This fMRI image shows activity in the posterior superior temporal sulcus pSTS region of the brain of a test subject who is recognizing a facial expression. If the area of damage is specific to only part of the primary motor cortex, such as the hand area of the homunculus, it will affect movements only of the corresponding part of their body, for example, the hand. As with other parts of the brain, when neurons of the primary motor cortex are damaged they will never regrow or repair. The areas that produce movement in parts of the body are found in the primary motor cortex or precentral gyrus.
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A Neurosurgeon’s Overview the Brain's Anatomy

The distributed nature of the decision manifests in the joint activation of multiple motor areas that initiate the production of facial expression. The pituitary gland develops from an extension of the hypothalamus downwards and from a second component extending upward from the roof of the mouth. By locating these landmarks on the surface of the brain, it can effectively be divided into pairs of "lobes. Many simple or primitive functions that are essential for survival are located here. Increased anterior cingulate cortical activity in response to fearful faces: Paired-sample t -tests were performed in a voxel-by-voxel manner with SPM5 between the two groups, based on the difference between averaged brain activation signals measured during happy and sad facial emotion recognition, before and after treatment.
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As such, the amygdala might be responding primarily to the sensory consequences associated with the production of facial expressions. Comparing face patch systems in macaques and humans. These patients appear to have a hyperactive amygdalae manifested in increased anxiety, increased galvanic skin response and baseline cortisol, heightened vigilance, and decreased vagal tone Voon et al. The stimuli were presented automatically by a computer projecting onto a screen in front of the subject. Abstract Facial expressions reflect decisions about the perceived meaning of social stimuli and the expected socio-emotional outcome of responding or not with a reciprocating expression. They asked their volunteers to view pictures of different faces either fearful or neutral and houses serving as a control stimulus. Although major depressive disorder MDD has been examined by a large number of studies in genetics, biochemistry and neuroendocrinology, its causes and pathogenesis and effective treatments remain unclear.
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