文档介绍：524 ELECTROENCEPHALOGRAPHYAND CLINICALNEUROPHYSIOLOGY
VARIABILITY OF EVOKED AUDITORY
POTENTIALS AND ACOUSTIC INPUT CONTROL l
FREDERIC G. WORDEN, JAMES T. MARSH,
FREDERICK D. ABRAHAM2 AND JOHN R. B. WHITTLI~EY3
Department of Psychiatry and Brain Research Institute, Medical School,
University of California at Los Angeles, Calif. (.)
( for publication: March 6, 1964)
Variability of amplitude, wave form and except for 1 mm at their tips. For cats 28, 29 and
latency is characteristic of evoked auditory poten- 47, CN electrode tip separation was I mm so that
tials(EP)inchronic, unanesthetized preparations. both tips lodged in the cochlear complex. For the
An important factor contributing to thisvariabili- other three (64, 66, 67) CN electrode tips were
ty is change in acoustic input. Changes in the in- separated by 3 mm of insulation. The proximal
tensity and envelope ofthe acoustic stimulus from tips for these electrodes were located in the
point to point within a sound field (Von B6k~sy cerebellum (CC). Cortical electrodes consisted of
1900; Van den Endo 1960) are rather accurately single insulated wires (2 on each side) led through
paralleled by changes in the ampl