. Comparative physiology of the brain and comparative psychology. Brain; Psychology, Comparative. 32 COMPARATIVE PHYSIOLOGY OF THE BRAIN. FIG. 8. DIAGRAM FOR EXPLAIN- ING THE LOCALISING REFLEX IN MEDUSAE. (See text.) is impossible. Romanes concludes from this that there are radial lines of differentiated tissue pass- ing through all parts of the bell and that it is their function to transmit impressions to the manu- brium. He assumes that this tissue is of a nervous character. I believe that the whole phenomenon can be explained without the as- sumption of a special differ- entiation of nervou
. Comparative physiology of the brain and comparative psychology. Brain; Psychology, Comparative. 32 COMPARATIVE PHYSIOLOGY OF THE BRAIN. FIG. 8. DIAGRAM FOR EXPLAIN- ING THE LOCALISING REFLEX IN MEDUSAE. (See text.) is impossible. Romanes concludes from this that there are radial lines of differentiated tissue pass- ing through all parts of the bell and that it is their function to transmit impressions to the manu- brium. He assumes that this tissue is of a nervous character. I believe that the whole phenomenon can be explained without the as- sumption of a special differ- entiation of nervous tissue in radial directions. It seems to me that the following as- sumption is possible : Every localised stimulus leads to an increase in the muscular tension on all sides, which is most intense near the stimulated spot. Now if we decompose each of the lines of increase of tension (aa' ab' ac' ad' ae1, Fig. 8) radiating from the stimul- ated spot, into a meridional component aa' dd' bb', etc., and an equatorial component, it is evident that the lat- ter can have no influence on the manubrium. Only the meridional components can have an influence, and of these the one passing through the stimulated spot is the largest. This fact must necessarily cause a bend- ing of the manubrium toward the stimulated spot. It also shows why an incision parallel to the mar- gin of the umbrella makes an exact localisation impos- sible and only allows uncertain movements towards the stimulated quadrant. I hardly believe that the mechanisms for the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Loeb, Jacques, 1859-1924. New York, G. P. Putman's Sons; [etc. , etc. ]
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