192 Journal of Comparative Neurology. 



sensory and motor areas for special groups of muscles 

 seemed, to say the least, remarkable, and in the view of the 

 rather limited and cursory details given by Munk, it is not 

 surprising that other investigators w^ere somew^hat incredu- 

 lous.(') 



In closing the article, Munk offers a suggestion or two 

 upon our topic, not without interest. Sensations of innerva- 

 tion which accompany motion are of greatest importance in 

 assisting in the formation of concepts of motions of the 

 body. From such innervation sensations the primary con- 

 cepts of motor acts are derived in the young, and in case of 

 loss of such concepts of motor acts in the adult by injury to 

 the specific centres, they may be recreated from the reflex 

 motions. 



While it may be very convenient to predicate volition 

 and voluntary motion as functions of the cortex, there is no 

 observational basis for such a localization. We simply know 

 that the cortex is the seat of perception and conception, and 

 we are only justified in assuming with Meynert that concepts 

 of motion are the causes of so-called voluntary motions; that 

 when such concepts arise from association, the motion fol- 

 lows eo ipso, unless in some way inhibited; and that the mo- 

 tion is the more extensive the greater the concept of motion 

 producing it. The perception of the intensity of will in 

 voluntary motion is an attribute of a concept of motion. 



Those familiar with the recent literature of physiological 

 psychology will observe that these statements are somewhat 

 at variance with those of Wundt, etc. 



In the fourth contribution(-) new evidence is added to the 

 same eflfect. The whole available surface of the cerebrum 

 was found to contain sensory centres, even the frontal region, 

 usually relegated to higher faculties, not excepted. Instead 

 of psycho-motor and psycho-sensory centres there are only 

 sensory areas. The cortex has only to do with perceptions 



1 See siipr.i p. 99. 



2 Verliand. der Hliysiolog. Gcsellsch. zu Berlin, 1878-79, Nr. 4, 5. 



