Auditory brainstem responses to single-slope stimuli. The influence of steepness and polarity

• Published in: Scandinavian audiology Vol. 16; no. 4; p. 227
• Main Authors: Gerull, G, Mrowinski, D, Janssen, T, Anft, D
• Format: Journal Article
• Language: English
• Published: Denmark 1987
• Subjects: Adult; Audiometry, Evoked Response; Brain Stem - physiology; Evoked Potentials, Auditory; Humans; Loudness Perception - physiology; Middle Aged; Pitch Perception - physiology; Reaction Time - physiology; Reference Values
• ISSN: 0105-0397
• DOI: 10.3109/01050398709074945

Click polarity has little influence on brainstem potentials. We applied an auditory stimulus similar to a step function generated in a closed acoustic system. The influence of stimulus onset steepness (comprising rise time and intensity) on wave V latency and amplitude was investigated. A remarkable latency prolongation was observed for condensation (C) compared with rarefaction (R), if a sharp bend at the foot of the slope was avoided. The C latency lag was nearly the amount of rise time. The effect can be explained by cochlear travel time. Wave V amplitude for R slopes was significantly enhanced. At high intensity and short rise time, it reached twice the values found with C slopes, or with clicks of either polarity. Although the explanations found are not yet satisfactory, a clinical application in cochlear diagnosis is predictable.