By Margaret E. Brown (Eds.)
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Additional info for The Physiology of Fishes. Behavior
The same retinal influx that does not cause spinning in the former case, does in the latter because of the direction of movement with which it is combined. N and T mark nasal and temporal poles of the eye ( from Sperry, 1950a ). arise centrally as part of the excitation pattern of the overt movement. Thus, any excitation pattern that normally results in a movement that will cause a displacement of the visual image on the retina may have a corollary discharge into the visual centers to compensate for the retinal 1 Thanks are due to Prof.
In three fish with the left eye rotated and the right eye covered with a blinder, removal of the blinder was followed by cessation of the circling. Sperry supposed that the fish responded to the stimuli entering the normal eye while inhibiting the effects of those entering the rotated eye. Excision of the left optic lobe resulted in a resumption of the circling and this continued until the rotated eye was returned to its normal position. The results point to the optic tectum as the controlling center but they "do not exclude the possibility that the optic lobe serves merely as an afferent way-station through which the retinal impulses must pass on their way to an integrating centre at some lower level of the neuraxis.
He also found that after cutting two dorsal roots a desensitized skin region is formed passing as a band from the dorsal midline, slanting slightly posteriorly, and not reaching the ventral midline. If only one dorsal root is severed no insensible region of the skin is produced at all. This indicates an overlap in the dermatomes which is more strongly emphasized ventrally because of their greater breadth in this region. Van Rijnberk (1904-1905, 1917) similarly demonstrated the presence of an overlapping cranial-caudal arrangement of dermatomes in the pectoral fins of S.
The Physiology of Fishes. Behavior by Margaret E. Brown (Eds.)