John Newport Langley,
Popular Science Monthly
(1884)
“ I wish, however, to lay stress on this, that it is highly probable that impulses traveling from any peripheral nerve-ending to a nerve-center, or from any one nerve-center to any other, may, under certain circumstances, diminish or annul the functional activity of the nerve-center—that is, may inhibit it. And there is equal reason to believe that, under certain other circumstances, the effect produced will not be inhibition, but an increase of activity of the center. ”
