Pain and pleasure . he man. Likewise the dogs brain fallsfar short of the mans in development; but forthose mental abilities in which the dog surpassesman, as, for example, the sense of smell, there isa special brain part (the olfactory lobe), whichis tremendously enlarged to correspond to hisextra capacity. (3) The fact that by stimulating certain partsof the brain it is possible to produce definite re-actions. These reactions may be primarily motor,as when by applying a weak electric current to theRolandic (upper central) part of a dogs brain, wesucceed in producing now a movement of the fro
Pain and pleasure . he man. Likewise the dogs brain fallsfar short of the mans in development; but forthose mental abilities in which the dog surpassesman, as, for example, the sense of smell, there isa special brain part (the olfactory lobe), whichis tremendously enlarged to correspond to hisextra capacity. (3) The fact that by stimulating certain partsof the brain it is possible to produce definite re-actions. These reactions may be primarily motor,as when by applying a weak electric current to theRolandic (upper central) part of a dogs brain, wesucceed in producing now a movement of the frontlegs, now a wagging of the tail, now a the effects may be sensory, as when we ob-serve that in exploring the skin with a warm,pointed cylinder, as often as the area touched cor-responds to the location of a certain kind of nerveending (corpuscle of Ruffini) under the skin, weare aware of the sensation of warmth. Always and everywhere the story has been thesame; more and more special nervous facts are. Figs. 6 and —Fig. 6 at the left shows the general relations of thecentral nervous system to the bones of the skull and spine. Figure7, at the right, displays the general contours of the central systemas seen from in front. The great ganglionated cord of the sympa-thetic system is shown attached to one side of the spinal^ nerves;the other side has been cut away. Cer., the cerebral hemispheres;O, the olfactory centers; M, the medulla oblongata; Cb., the cere-bellum; , the spinal cord; I, the olfactory nerve; II, the opticnerve; VIII, the auditory nerve; C, the first cervical spinal nerve;Dxt the first dorsal, or thoracic, nerve; L±, the first lumbar nerve; Si,the first sacral nerve. (From Angells Psychology, Courtesy HenryHolt & Co.) 98 PAIN AND PLEASURE 99 being found to have an invariable connection withcertain special mental facts. The advance ofphysiological psychology in this direction has beenof a sort to justify ambitious hopes for the future. No psy
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectpain, bookyear1917
