. Comparative physiology of the brain and comparative psychology. Brain; Psychology, Comparative. EXPERIMENTS ON VERTEBRATES movements. It was for a long time a dogma that progressive locomotive movements could only be per- formed by frogs that were still in possession of their cerebral hemispheres. This statement was made by Flourens. He observed that frogs devoid of the cerebral hemispheres no longer move spontaneously (3). Later on Schra- der showed that this observation was not correct; that this lack of spontaneity only occurs when the thai- ami optici are injured (4). Are we to con- clud
. Comparative physiology of the brain and comparative psychology. Brain; Psychology, Comparative. EXPERIMENTS ON VERTEBRATES movements. It was for a long time a dogma that progressive locomotive movements could only be per- formed by frogs that were still in possession of their cerebral hemispheres. This statement was made by Flourens. He observed that frogs devoid of the cerebral hemispheres no longer move spontaneously (3). Later on Schra- der showed that this observation was not correct; that this lack of spontaneity only occurs when the thai- ami optici are injured (4). Are we to con- clude from this that the power of spontan- eous locomotion is lo- cated in the thalami optici ? This would be wrong, for if the whole brain of a frog including the pars commissuralis of the medulla oblongata be removed, it seems " possessed of an irre- sistible desire to move ; it creeps about untiringly in an entirely coordinated manner and does not rest until it comes to a corner of the enclosure" (Schrader). It behaves like the Nereis in Maxwell's experiments which was deprived of its brain. Flourens made his. FIG. 35. THE FROG'S BRAIN. Gff, cerebral hemispheres; , thalamus opticus; Lob. oft, lobi optici; A'//, cerebellum ; l^-JCf, origin of the sth to nth brain-nerves. (After Wiedersheim.). 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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