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At least 1,207 records · Page 67Linked to original sources
PubMed1987

[Responses evoked in "steady state" in man by means of a sinusoidal frequency modulation].

The response of the human auditory system to a 40 Hz sinusoidal modulation of the frequency of a tone can be reliably recorded from the human scalp using Fourier analysis. With increasing intensity the amplitude of the response becomes larger and its phase delay shorter. The response amplitude is larger and the phase delay longer for lower carrier frequencies. The response may possibly become useful in the objective evaluation of frequency discrimination.

Adult↗
PubMed1987

Auditory-evoked potential to pattern-reversal stimulation.

The late auditory-evoked potential (AEP) was studied in response to a frequency-modulated complex synthesized from discrete tones, somewhat analogous to visual stimulation using reversals of alternating light and dark stripes. The "pattern-reversal' AEP was found to be a heartier response than the familiar transient-evoked AEP (e.g. tone-burst-elicited potential), but the latencies of the component potentials were longer. The apparent enhancement of the AEP is postulated to be due to response summation across critical bands, akin perhaps to loudness growth as stimulus bandwidth increases.

Acoustic Stimulation↗
PubMed1995

Aging effects on auditory middle latency responses.

Age-related effects on auditory middle latency responses (MLR) were studied in 51 normal subjects. The linear relationship between the amplitude of Na-Pa and Pa-Nb components and aging was observed, although there was no correlation between aging and the latencies of Na, Pa and Nb. The increases in the amplitudes of Na-Pa and Pa-Nb components might reflect the age-related change of auditory responses.

Acoustic Stimulation↗
PubMed2001

A comparison of threshold estimation methods in children 6-11 years of age.

Estimating detection threshold for auditory stimuli in children can be problematic because of lapses in attention and the time limits usually imposed by scheduling restrictions or fatigue. Data reported here were collected to compare the stability of threshold estimation procedures in testing children ages 6 to 11 in a three-alternative, forced-choice paradigm. Stimuli consisted of a 1-kHz tonal signal and a Gaussian noise masker, bandpass filtered between 500-2,000 Hz and presented at 25-dB spectrum level. The signal was either presented for 400 ms in the presence of a continuous masker (simultaneous masking) or for 10 ms just prior to a 400-ms masker (backward masking). For each masking paradigm the 79% correct threshold was assessed via each of three procedures: 3-down, 1-up adaptive staircase (Levitt), maximum likelihood estimation (MLE), and method of constant stimuli. Percent correct was measured at the end of the study for a signal 10 dB above the previously determined threshold in order to estimate the most appropriate psychometric function asymptote for fitting data collected via the method of constant stimuli. Both the MLE and Levitt procedures produced equally stable threshold estimates for both conditions and age groups. This was the case despite considerable variability in backward-masking thresholds.

Adult↗