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Effects Of Auditory And Visual Distracters On Acceptable Background Noise Level In Hearing-Impaired Listeners, Elizabeth A. Ripley
Effects Of Auditory And Visual Distracters On Acceptable Background Noise Level In Hearing-Impaired Listeners, Elizabeth A. Ripley
Dissertations, 2014-2019
Acceptable Noise Level (ANL), is an established procedure for determining the amount of background noise a listener is willing to accept while listening to speech. ANL is established by having the listener select most amount of background noise they are willing to accept while listening to a speech stimulus presented at their most comfortable listening level (MCL). While ANLs have been established as good predictors of hearing aid use, little is known on how hearing aid users accept background noise while engaged in cognitively demanding tasks. Previous research in normal hearing listeners has demonstrated that listeners will allow the most …
The Neural Representation And Behavioral Detection Of Frequency Modulation, Daniel Elliott Shearer
The Neural Representation And Behavioral Detection Of Frequency Modulation, Daniel Elliott Shearer
Dissertations, 2014-2019
Understanding a speech signal is reliant on the ability of the auditory system to accurately encode rapidly changing spectral and temporal cues over time. Evidence from behavioral studies in humans suggests that relatively poor temporal fine structure (TFS) encoding ability is correlated with poorer performance on speech understanding tasks in quiet and in noise. Electroencephalography, including measurement of the frequency-following response, has been used to assess the human central auditory nervous system’s ability to encode temporal patterns in steady-state and dynamic tonal stimuli and short syllables. To date, the FFR has been used to investigate the accuracy of phase-locked auditory …
Effects Of Eph/Ephrin Mutations On Pre Pulse Inhibition In Mice, Andrea Marie Liuzzo
Effects Of Eph/Ephrin Mutations On Pre Pulse Inhibition In Mice, Andrea Marie Liuzzo
Dissertations, 2014-2019
The acoustic startle response (ASR) is a reliable reflexive behavioral response in mammals elicited by an unexpected intense acoustic startle eliciting stimulus (SES). It is mediated by a sub-cortical pathway that includes the inferior colliculus (IC). The ASR amplitude can be measured with an accelerometer beneath the subject attached to the cage, and can be decreased in amplitude by presenting a less intense, non-startling stimulus 20-300 ms before the SES. This reflexive decrement in ASR is called pre pulse inhibition (PPI) and indicates that the relatively soft pre pulse was heard. Murine species have been used to study this response …