Every time I do this, association processes are being set up
in the brain between the auditory centres and the centres of phonation; and
when I try to revive in my silent thoughts the melody again, I do so best
by humming aloud a few bars of the melody to start the revival and then
continuing the revival by maintaining the resonator in the position of
humming the tune, viz. with closed lips, so that the sound waves can only
escape through the nose; under such circumstances the only definite
conscious muscular sensation I have is from the effect of closure of the
lips; the sensations from the larynx are either non-existent or quite
ill-defined, although I hear mentally the tonal sensations of the melody.
No doubt by closing the lips in silent humming I am in some way
concentrating attention to the sensori-motor sphere of phonation and
articulation, and by reactive association with the auditory sphere
reinforcing the tonal sensations in the mind. The vocal cords (ligaments)
themselves contain very few nerve fibres; those that are seen in the deeper
structures of the cords and adjacent parts mainly proceed to the mucous
glands. This fact, which I have ascertained by numerous careful
examinations, is in accordance with the fact that there are no conscious
kinaesthetic impressions of alterations of position and tension of the vocal
cords.
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