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CORTICAL PROJECTION OF LABYRINTHINE IMPULSES: STUDY OF AVERAGED EVOKED RESPONSES
Pages 259-270

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From page 259...
... MOFFET, AND J EGYED Temple University Medical School SUMMARY While the observation of the eyeballs, of the reactions of the trunk, and of the extremities permits only a study of the vestibulo-ocular and of the vestibulospinal reflex arcs, the perrotatory or postrotatory recording of the electroencephalogram or electrocorticogram may help one to ascertain the conduction of labyrinthine impulses and their projection to the cerebral cortex.
From page 260...
... To prevent interference of retinal impulses, the eyelids of the experimental animals and human subjects were kept closed during the rotations.
From page 261...
... L.Es.m.: Left gyrus ectosylvius medius. L.Ss.m.: Left gyrus suprasylvius medius.
From page 262...
... L.Es.a.: Area of ablation of left gyrus ectosylvius anterior. L.Ss.m.: Left gyrus suprasylvius medius.
From page 263...
... LS.H FIGURE 8. -- Averaged spontaneous discharges and responses following 30 single counterclockwise rotations.
From page 264...
... Results and Discussion The cortical responses obtained by the averaging technique at the onset of rotation had voltages varying between 10 piV and 100 /iV and lasted between 20 and 60 msec. Their peak latencies, i.e., from the beginning of rotation to the peak of the response, were between 10 and M M i If FIGURE 11. -- Angular displacements (i£)
From page 265...
... If one accepts this classification according to the latent period, the responses obtained by the averaging technique would have to be considered as belonging partly to the specific primary and partly to the specific associative responses. There was no definite difference in the response, whether the rotation was directed toward or away from the hemisphere on which the recording electrodes had been placed.
From page 266...
... They assumed that afferent fibers with a specific function exist within the unspecific system. Our present findings seem to indicate that angular acceleration may, at least in some instances, also induce responses with relatively short latency; i.e., primary specific and/or specific associative responses in the vicinity of the visual cortex.
From page 267...
... . Other electrode positions: 1, at the gyrus sylvius posterior close to the lower part of the sulcus ectosylvius posterior; 10, gyrus ectosylvius posterior, upper part; 12, gyrus suprasylvius, corner between middle and posterior pan; 13, gyrus lateralis, corner between middle and posterior part.
From page 268...
... GRUSSER, O J.; AND GRUSSER-CORNEHLS, U.: Mikroelektrodenuntersuchungen zur Konvergenz vestibularer und retinaler Afferenzen an einzelnen Neuronen des optischen Cortex der Katze.
From page 269...
... SESSION IX Chairman: WILLIAM E COLLINS Civil Aeromedical Institute


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