The _brain_ does not _think_. It
is as purely physical as any other part of the body. It just _handles_,
or transmits in and out, to and from the _mind_, the various impressions
sent _in_ by different sense muscles, and the mental reflexes or
impulses sent _out_ by the innumerable mind centers. Your mind works
_through_ your brain. Of course, therefore, the quality and quantity of
mental work _you_ are capable of doing are limited by the degree of
handling-or-transmitting _efficiency_ characteristic of _your_
particular brain structure.
[Sidenote: Value of Practical Psychology]
Any interference with the _brain_ quality or quantity of an individual
naturally interferes with his normal _mental_ functioning. If a
particular part of a man's brain is injured, the associated mind center
is harmed likewise and his mental _quality_ is affected in proportion.
Should a certain portion of his brain be cut out, the total _quantity_
of his mental powers would be correspondingly reduced. We all know these
things about the brain and the mind.
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