The Journal of Comparative Neurology and Psychology, Volume 18Editorial Office, Denison University, 1908 |
Contents
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Common terms and phrases
Anat anatomy animal appears archipallium average behavior Biol body weight body-orientation brain weight branches branchial caudad cent centers central nervous system centrosome chromophilous color commissura infima commissural nucleus commissure cortex curve cutaneous cytoplasm diameter direction electric box experiments fact female fishes frog funicular funicular nucleus ganglion cells gill sac given glass granules imitation innervating intensity internodes larva larvæ lateral lateralis length light lobsters male maze medulla medulla oblongata medullated ment minutes motor fibers mouse movements muscles myotomes negative nerve cells neurones NISSL NISSL bodies observations olfactory organs orientation paper photopathic phototactic phototaxis Physiol pipiens position posterior psychology ramus reaction reflex region relation sensory side somatic species spinal cord spinal ganglion spinal nerves stimulus structure tests tion tract trials trunk tube turn University vacuoles ventral commissure ventral roots vertebrates
Popular passages
Page 287 - This orientation is produced, according to this tropism theory, by the direct action of the stimulating agent on the motor organs of that side of the body on which it impinges. A stimulus striking one side of the body causes the motor organs of that side to contract or extend or to move more or less strongly. This, of course, turns the body, till the stimulus affects both sides equally; then there is no occasion for further turning, and the animal is oriented.
Page 514 - The precise way each part shall act under the influence of the stimulus must be determined by the past history of that part; by the stimuli that have acted upon it, by the reactions which it has given, by the results which these reactions have produced (as well as by the present relations of this part to other parts, and by the immediate effects of its present action).
Page 16 - It is commonly reported that they have an instinctive liking for mice, and that mice have an instinctive fear of cats. It is supposed that the odor of a mouse will arouse a cat and that the odor of a cat will frighten a mouse. My experiments tend to show that this belief is not in harmony with the facts. When cats over five months old were taken into the room where mice were kept they did not show the least sign of excitement. A cat would even allow a mouse to perch upon its back, without attempting...
Page 608 - Neur., vol. 10, no. 2. 1902 On the number and on the relation between diameter and distribution of the nerve fibers innervating the leg of the frog (Rana virescena brachycephala, Cope).
Page 304 - ... the stimulus impinges and only indirectly on the motor organs through their nervous connection with the sense organs. When thus modified the theory of course loses its simplicity and its direct explaining power, which made it so attractive. In order to retain any of its value for explaining the movements of organisms, it would have to hold at least that the connections between the sense organs and the motor organs are of a perfectly definite character so that when a certain sense organ is stimulated...
Page 110 - Number and size of the spinal ganglion cells and dorsal root fibers in the white rat at different ages.
Page 76 - On the structure, micro-chemistry and development of nerve cells, with special reference to their nuclein compounds.
Page 514 - ... result of development. We cannot look upon it as a final thing ("etwas Letztes, Naturgegebenes "), because there is a history behind it, and we know as solidly as we know anything in physiology that the history of the organism does modify it and its actions — in ways not yet thoroughly understood, doubtless, yet uone the less real.
Page 514 - ... well as by the present relations of this part to other parts, and by the immediate effects of its present action). In other words, this complex, harmonious working of the parts together is only intelligible on the view that there is a history behind it ; that it is the result of development.
Page 189 - Further observations on the nervous system of the American leopard frog (Rana pipiens) compared with that of the European frogs (Rana esculenta and Rana temporaria).