Abstract
The pattern of jaw movements and the occurrence of tooth contacts and tooth clenching—recorded by intraoral radiotransmitters—were investigated in nineteen anaesthetized and in four unanaesthetized rabbits. Jaw movements were induced by electrical stimulation of the sensory-motor area in the cerebral cortex, of the antero-lateral part of the amygdala and of the lateral hypothalamic area (LHA). Each investigated area induced a typical jaw movement during stimulation, although cortical stimulation induced more than one type of jaw movement from different areas of the jaw motor cortex. Tooth contacts were regularly recorded during amygdaloid stimulation, irregularly during stimulation of the LHA and the postero-lateral area of the cortex, but not during jaw movements from the anterior and medial parts of the sensory-motor area of the cerebral cortex. Tooth contacts occurred only in the jaw side contralateral to the brain stimulation. Tooth contacts during jaw movements were most marked at a stimulation frequency of 30–75 c/s, disappearing at frequencies above 100 c/s. Spontaneous tooth contacts of the unanaesthetized animal were also observed.
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