( 1B7 ) 



long expirations, nay even by the expiration-position of the thorax, 

 and at the same time a distinct retardation of the pulse is seen to 

 follow as a consequence of that stimulation. The influence on the 

 respiration of electric stimulation of this point 16 is perfectly con- 

 stant, and can be brought about in all phases of the respiration, 

 as fig. XXYIII proves. There is always stronger inspiration etc. 



Summa summarum. By stimulation of a very small region in 

 fJie frontal lobe of a dog's brain, acceleration of respiration, ten- 

 dency to deep inspiration, acceleration of pulsation, contraction of the 

 extensor-muscles of hand and neck may he brought about, followed 

 by retardation of pulsation and long expiration. 



The movements expressing attention are consequently localized on 

 a comparatively small area of the cortex of a dog's brain and may 

 be demonstrated experimentally. 



§ V. Conclusion. 



Let us now return to the theory of the parallelism between phy- 

 siological and psychical events. 



I have shown in a series of arguments, that any man, fixing 

 his attention, performs a constant series of movements. I do not 

 mean to say that these are the only movements, through which 

 the attentive man differs from himself, as he is in a not attentive 

 state. I am convinced that there is a great deal to be done in this 

 direction. But the movements described here form a sharply defined 

 group. I believe that they ail depend on a modified respiration. 



Self-observation teaches us, that we turn our attention actively 

 to a perception. We are justified in assuming that representations 

 of movements possess an active character for the self-observation. 

 We find attentively examined representations also connected with the 

 representation of movement, and in consequence provided with the 

 same character. 



The physiological process parallel to attention, from the point of 

 view of the association-physiology may be explained by the existing 

 complexes of movements. A special complex of movements may be 

 produced by means of an electric current from the cortex of a dog's 

 brain. It is on a larger scale exactly the same combination of 

 movements which is found in the attentive man. 



When a physiological change whose parallel series is e.g. a visual 

 representation, propagates and brings about a new change in the 

 psycho-motor inspiration centre, there is for the sell-observation, a 



