. Comparative physiology of the brain and comparative psychology. Brain; Psychology, Comparative. EXPERIMENTS ON ECHINODERMS 63 destroy the nervous connection between the arms, for instance, by making two incisions at a and 6, Fig. 18, this cooperation of the arms ceases. The normal starfish requires but a few minutes to turn over, but the specimen represented in Fig. 18 remained on its. FIG. 18. THE SAME EXPERIMENT ON A STARFISH WHOSE NERVE-RING HAS BEEN SEVERED IN TWO PLACES (a AND b). The right and left arms are consequently no longer connected nervously. If such an ani- mal is laid on its
. Comparative physiology of the brain and comparative psychology. Brain; Psychology, Comparative. EXPERIMENTS ON ECHINODERMS 63 destroy the nervous connection between the arms, for instance, by making two incisions at a and 6, Fig. 18, this cooperation of the arms ceases. The normal starfish requires but a few minutes to turn over, but the specimen represented in Fig. 18 remained on its. FIG. 18. THE SAME EXPERIMENT ON A STARFISH WHOSE NERVE-RING HAS BEEN SEVERED IN TWO PLACES (a AND b). The right and left arms are consequently no longer connected nervously. If such an ani- mal is laid on its back, the tube-feet of four or even all the arms in most cases tug simultaneously. This prevents the animal from righting itself. back the whole afternoon, although the arms were struggling constantly to right it. The experiments seem to indicate that in a normal starfish the stimulus produced by the pulling of two or three arms in the same direction has an inhibitory effect on the other arms. This inhibition ceases when the nervous con- nection between the single arms is broken. Romanes. 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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