AMONG the topics which Kinnier Wilson 1 has selected as representing some modern problems in neurology is that presented by the clinical picture of dissociation of the voluntary and emotional innervation of the facial muscles. It has long been known that patients suffering a paralysis of volitional movement of the facial musculature, as a result of supranuclear cortical or capsular lesions, may retain an activity of these muscles in the expression of emotion. Conversely, cases have been reported in which voluntary activation of the facial muscles has been unimpaired, while emotional excitement failed to produce the appropriate facial expression.In his review of this subject, Kinnier Wilson 2 has suggested in explanation that the voluntary and emotional innervations of the facial nuclei are effected by different systems within the brain. Enlarging upon this suggestion, Wilson has postulated a brainstem mechanism which subserves the synkinesis of the facial, vocal and respiratory activity observed in emotional behaviour. Further elucidation has been provided by Bard 3 in a consideration of facial and vocal activity from the point of view of his 4' 5 recent studies of the brainstem mechanisms involved in the expression of emotion.Our interest in this problem has developed from a series of investigations of these brainstem mechanisms
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