The effect of background noise on subcortical neural encoding of speech in normal hearing individuals
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Type of Workapplication/pdf
x, 106 pages
DepartmentTowson University. Department of Audiology, Speech-Language Pathology and Deaf Studies
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The purpose of the current research is to investigate the effects of background noise on subcortical neural encoding of speech in normal hearing individuals. It was proposed that increasing levels of background noise would degrade the Frequency Following Response (FFR). Six participants (age 23-24 years) participated in the current study. The Frequency Following Response was recorded on all six subjects in four different conditions: clean, 0 dB SNR, + 5 dB SNR, and -5 dB SNR. Grand average temporal waveforms were obtained across the 6 subjects for each listening condition. MATLAB software was used to analyze the temporal waveforms in the frequency domain. An FFT analysis was used to break down the response into the constituent frequencies. The magnitude of energy in the FFR spectrum at the fundamental frequency and first formant were measured in each test condition for each individual participant. Mean FFT values and standard deviation were also calculated. Results showed that the F0 magnitude and derived SNR for F1 decreased with increasing levels of background noise. Overall, it was concluded that the FFR was most degraded in the most severe background noise listening condition.