The fewer the impressions that come into the mind through the brain, the
less does a man know. And only the impressions that come into a
_particular_ mind center develop _that_ center. (For example, the
development of keenest eyesight by many _optical_ impressions would not
affect at all a man's ability to discriminate among the tones of music,
would not give him "a good _ear_.")
[Sidenote: Weak or Undeveloped Centers]
It is evident, therefore, that if a _particular brain center_
temporarily or permanently is deprived of right and sufficient exercise
in transmitting sense impressions, _its coordinated mind center_ will be
stunted in its growth or starved for lack of mental food. This is why a
man is awkward in using his native tongue when he returns to the country
of his birth after a long residence among people of a different nation
where that language was not spoken. But a little exercise of his brain
in transmitting again the sound of his native tongue will quickly
stimulate his mind with the renewed supply of this particular mental
food to which it formerly was accustomed.
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