Effects of variations in stimulus rise-decay time upon the early components of the auditory evoked response

Beiter, Robert C.; Hogan, Donald D.

doi:10.1016/0013-4694(73)90050-3

Cited by 12 publications

(2 citation statements)

References 6 publications

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“…Tones with longer rise times have greater acoustic frequency specificity ͑Burkard, 1984; Gorga and Thornton, 1989;Jacobson, 1983;Stapells and Picton, 1981͒. The current literature on the effects of rise time on the MLR, however, shows significant decreases in MLR amplitude when rise times exceed 5 ms ͑Beiter and Hogan, 1973;Vivion et al, 1980͒, similar to that reported for the ABR ͑e.g., Stapells and Picton, 1981͒. To date, only three published studies have directly compared the frequency specificity of the ABR to the MLR to tonal stimuli and these have reported conflicting results ͑Mackersie et al., 1993;Smith et al, 1990;Wu and Stapells, 1994͒. Smith and colleagues employed forward masking of 2000-Hz probe tones with gerbils and reported that the MLR is less frequency specific than the ABR.…”

Section: Introductionmentioning

confidence: 58%

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

Oates

Stapells

1997

The Journal of the Acoustical Society of America

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This study investigated the frequency specificity of the auditory brainstem (ABR) and middle latency (MLR) responses to 500- and 2000-Hz brief tones using high-pass noise masking. Stimuli were linear- (2-1-2 cycles) and exact-Blackman- (5 cycles) gated tones presented at 80 dB peak-to-peak equivalent (ppe) SPL. Cochlear contributions to ABR wave V-V' and MLR wave Na-Pa were assessed by the effects of high-pass noise masking on response amplitudes and latencies. The high-pass noise results demonstrate that the ABR and the MLR to the 80 dB ppe SPL brief tones show good frequency and place specificity. Changes in ABR or MLR amplitude and latency with high-pass noise masking did not occur as the masker cutoff was decreased from 2 to 3 octaves above the stimulus nominal frequency until it was within one-half octave of this frequency, below which amplitudes rapidly decreased (500- and 2000-Hz tones) and latencies increased (500-Hz tones). No significant differences existed in the frequency specificity of the ABR versus MLR, or in these evoked potentials to exact-Blackman- versus linear-gated tones.

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Section: Introductionmentioning

confidence: 58%

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

Oates

Stapells

1997

The Journal of the Acoustical Society of America

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“…In terms of inferential statistics, only the Na and Pa deflections were analyzed in further detail, given that the preceding MLAERs of No and Po and the subsequent MLAERs of Nb and Pb are thought to be largely unreliable in nature ͑Amenedo and Diaz, 1998;Beiter and Hogan, 1973;Thornton et al, 1977;Woods and Clayworth, 1995͒. Peak latencies for Na and Pa were quantified according to the time ranges reported in Woods et al ͑1993, 1995͒. Peak latency and amplitude for Na were defined as the maximum negativity between 15 and 25 ms after stimulus onset, while peak latency and amplitude for Pa were defined as the maximum positivity between 25 and 36 ms after stimulus onset.…”

Section: Discussionmentioning

confidence: 99%

Representation of concurrent acoustic objects in primary auditory cortex

Dyson

Alain

2003

The Journal of the Acoustical Society of America

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Auditory scene analysis involves the simultaneous grouping and parsing of acoustic data into separate mental representations (i.e., objects). Over two experiments, we examined the sequence of neural processes underlying concurrent sound segregation by means of recording of human middle latency auditory evoked responses. Participants were presented with complex sounds comprising several harmonics, one of which could be mistuned such that it was not an integer multiple of the fundamental frequency. In both experiments, Na (approximately 22 ms) and Pa (approximately 32 ms) waves were reliably generated for all classes of stimuli. For stimuli with a fundamental frequency of 200 Hz, the mean Pa amplitude was significantly larger when the third harmonic was mistuned by 16% of its original value, relative to when it was tuned. The enhanced Pa amplitude was related to an increased likelihood in reporting the presence of concurrent auditory objects. Our results are consistent with a low-level stage of auditory scene analysis in which acoustic properties such as mistuning act as preattentive segregation cues that can subsequently lead to the perception of multiple auditory objects.

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