Cerebral dominance and muscle tone at rest

This study examined some aspects of the relationship between muscle tone at rest and cerebral dominance. Right and left EMG recordings of sternocleidomastoid, trapezium, orbicularis oculi, and frontalis muscles were taken on 40 female subjects between 19 and 30 yr. of age. Analysis of total score for right and left muscles gave three groups: right-dominant subjects with higher myographic score on the right (42.5%), left-dominant subjects with higher myographic score on the left (52.5%), and non-dominant subjects with no difference between right and left myographic score (5%). Moreover, right-dominant subjects showed a greater right-left difference for the sternocleidomastoid, the trapezium, and the frontalis, left-dominant subjects for the trapezium and the frontalis.