Simultaneous Recording of Early and Middle Components of Auditory Electric Response

Effect of noise exposure on gap detection in rats

“…MLR thresholds were used for estimating hearing sensitivity in the animals. The assessment of hearing sensitivity by electrophysiological methods (recording auditory brainstem responses and MLR) in humans and in animals with normal hearing or with hearing loss proved to be in good agreement with the assessments obtained with behavioural techniques (Davis, 1965;Pratt and Sohmer, 1978;Suzuki et al, 1981;Borg, 1982;Henderson et al, 1983). Post-exposure changes in GDT and the threshold and amplitude of MLR were monitored for two months.…”

Frequency specificity of the human auditory brainstem and middle latency responses to brief tones. I. High-pass noise masking

“…Contrary to these results, many studies have been successful in recording replicable and clearly identifiable ABRs to air-conducted 500-Hz stimuli both in quiet and in the presence of ipsilateral notched noise and/or HP noise masking, down through 55 dB peak-to-peak equivalent ͑ppe͒ SPL and lower ͑Davis and Hirsh, 1979;Hyde, 1985;Hyde et al, 1987;Jacobson, 1983;Kileny, 1981;Kodera et al, 1977a;Munnerley et al, 1991;Sininger et al, 1997;Stapells, 1984Stapells, , 1989Stapells et al, 1995;Stapells and Picton, 1981;Stapells et al, 1994Stapells et al, , 1990Suzuki et al, 1977Suzuki et al, , 1981Suzuki et al, , 1984Wu and Stapells, in preparation͒. In addition, high correlations ͑i.e., у0.9͒ between ABR thresholds to 500-Hz air-conducted tones in notched noise and/or HP noise and 500-Hz puretone behavioral thresholds have been demonstrated for normal and hearing-impaired subjects ͑e.g., Kileny and Magathan, 1987;Munnerley et al, 1991;Stapells et al, 1995 In view of the disagreement regarding the use of the ABR to 500-Hz tones to estimate low-frequency hearing sensitivity, the MLR has been proposed to be a better indicator of 500-Hz sensitivity ͑e.g., Kavanagh et al, 1984;Kileny and Shea, 1986;Palaskas et al, 1989;Scherg and Volk, 1983͒. This suggestion has been based on the observation that larger peak-to-peak amplitudes are measured for the MLR compared to the ABR in response to 500-Hz tones, leading to better detectability of the MLR ͑Scherg and Volk, 1983;Wu and Stapells, 1994, in preparation͒. A commonly held belief is that the MLR may be recorded using tones with longer rise times than the ABR without causing a significant decrease in the amplitude of the response.…”

Morphological Changes in the Middle Latency Response Using Maximum Length Sequence Stimuli

“…A 100 msec click stimulus was used for all recordings, as were EAR-3A insert earphones. Online filter settings of 20-3000 Hz, with a 6 dB per octave roll-off, were utilized for all recordings (Suzuki et al, 1981;Suzuki and Hirabayashi, 1987;Musiek and Lee, 1997) Every waveform was replicated and the replications averaged together for analysis.…”