title: Different functional properties of on and off components in auditory brainstem responses to tone bursts.
abstract: Auditory brainstem responses to tone bursts of constant rise and fall time and variable plateau were obtained in 7 normal hearing adults with a vertex to mastoid electrode configuration. In all records, two vertex-positive components (A, B) were present. Peak A is probably an onset response. Peak B latency increased linearly with plateau duration (r = 0.93) and seems to be an off response. White and notched acoustic noise masking had a different effect on the two components. A greater latency shift was observed for peak A than for peak B, thus reducing the interpeak interval in the masked response. When using high-pass noise, as we lowered the cut-off points from 4 to 0.5 kHz, there was also a greater latency increment for peak A than for peak B. These results suggest a more apical cochlear origin for the off response.
authors.affiliation: National Scientific Research Center, Neurosciences Branch, Habana, Cuba.
authors.forename: M C
authors.initials: MC
authors.lastname: Pérez-Abalo
authors.forename: M J
authors.initials: MJ
authors.lastname: Valdés-Sosa
authors.forename: M A
authors.initials: MA
authors.lastname: Bobes
authors.forename: L
authors.initials: L
authors.lastname: Galán
authors.forename: R
authors.initials: R
authors.lastname: Biscay
mesh_terms: D000328:Adult; D001933:Brain Stem / Q000502:physiology; D003051:Cochlea / Q000502:physiology; D005072:Evoked Potentials, Auditory; D005260:Female; D006801:Humans; D008297:Male; D009622:Noise; D010470:Perceptual Masking / Q000502:physiology; D011930:Reaction Time / Q000502:physiology