Walter Moxon and His Thoughts About Language and the Brain

Walter Moxon wrote a well-timed paper in 1866 on aphemia with accompanying right sided hemiplegia. Like many other investigators of this apparent lopsidedness of the articulatory system for human speech, Moxon had to reconcile left hemisphere specialization for this function with the overriding law of symmetry, which for a large sector of the scientific community was a sine qua non of the anatomy and function of high level animal cognition. His reasoning was essentially that since the right dominant hand (and hence the left hemisphere) in some sense led overall bilateral limb movement patterns, that the right side of the tongue would lead whole tongue movement for articulation, the left side following in some mechanical sense. Thus, Moxon could link left hemisphere dominance for handedness as well as for speech. His theory was that “attention” was focused on the left hemisphere during limb movement development, under his assumption that the articulators were limbs as well as the arms and hands. The present paper will examine the professional life of Moxon and his 1866 paper, as well as the scant commentary that it has elicited in the literature on the history of left hemisphere dominance for the human articulatory function.