The conditions necessary to the existence of speech arose with
articulation, and it is intelligence that has converted the vocal
instrument into the speaking instrument. For whereas correct intonation
depends upon the innate musical ear, which is able to control and regulate
the tensions of the minute muscles acting upon the vocal cords, it is
intelligence which alters and changes the form of the resonator by means of
movement of the lips, tongue, and jaw in the production of articulate
speech. The simple musical instrument in the production of phonation is
bilaterally represented in the brain, but as a speaking instrument it is
unilaterally represented in right-handed individuals in the left hemisphere
and in left-handed individuals in the right hemisphere. The reason for this
we shall consider later; but the fact supports Darwin's hypothesis.
Another hypothesis which was brought forward by Grieger and supported by
some authors is summarised by Ribot as follows: "Words are an imitation of
the movements of the mouth. The predominant sense in man is that of sight;
man is pre-eminently visual. Prior to the acquisition of speech he
communicated with his fellows by the aid of gestures and movement of the
mouth and face; he appealed to their eyes.
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