The principles of psychology . ed word! And we adults often catchourselves reiterating some meaningless word over and overagain, if by chance we once begin to utter it absent-mind-edly, that is, without thinking of any ulterior train of wordsto which it may belong. One more observation before closing these already tooprotracted physiological speculations. Already (Vol. I. p. 71)I have tried to shadow forth a reason why collateral inner- 592 PSYCHOLOGY. vation should establisli itself after loss of brain-tissue,and wlij incoming stimuli should find their way out again,after an interval, by thei
The principles of psychology . ed word! And we adults often catchourselves reiterating some meaningless word over and overagain, if by chance we once begin to utter it absent-mind-edly, that is, without thinking of any ulterior train of wordsto which it may belong. One more observation before closing these already tooprotracted physiological speculations. Already (Vol. I. p. 71)I have tried to shadow forth a reason why collateral inner- 592 PSYCHOLOGY. vation should establisli itself after loss of brain-tissue,and wlij incoming stimuli should find their way out again,after an interval, by their former paths. I can now explainthis a little better. Let S be the dogs hearing-centre whenhe receives the command * Give your paw. This iised todischarge into the motor centre M, of whose discharge Srepresents the kinsesthetic effect; but now M has been de-stroyed by an operation, so that S discharges as it can, intoother movements of the body, whimpering, raising thewrong paw, etc. The kinsesthetic centre S meanwhile has Ml. been awakened by the order S, and the poor animals mindtingles with expectation and desire of certain incoming sen-sations which are entirely at variance with those which thereally executed movements give. None of the latter sensa-tions arouse a motor circle, for they are displeasing andinhibitory. But when, by random accident, S and S dodischarge into a path leading through M^ by which ih^paivisagain given, and S^ is excited at last from without as well asfrom within, there are no inhibitions and the motor circle is formed: S discharges into M over and over again, andthe path from the one spot to the other is so much deepenedthat at last it becomes organized as the regular channel ofefflux when S is aroused. No other path has a chance ofbeing organized in like degree. CHAPTEE XXVII. OF OPERATING, AND SUSCEPTIBILITY. The hypnotic, mesmeric, or * magnetic trance cawhe induced in various ivays, each operator having his petmethod. The simple
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