Auditory signal path1/5/2024 ![]() Four waveform component measurements (500 Hz N1 onset latency, 4000 Hz N1 onset latency, 4000 Hz N1 offset latency, and 4000 Hz N1 offset amplitude) were enhanced (i.e., shorter latency and increased amplitude) in individuals with hearing loss compared to individuals with normal hearing. Waveforms obtained with broadband noise did not demonstrate significant differences between groups. Waveform amplitudes and latencies were measured for N1 onset, P2 onset, N1 offset, and P2 offset. Four experimental noise conditions were tested, including three noise conditions presented at 50 dB SL (500 Hz-centered narrowband, 4000 Hz-centered narrowband, and broadband) and one at 70 dB SL (broadband). The response was measured in 10 normal hearing participants and 7 participants aged 40 to 67 years with moderate high-frequency sensorineural hearing loss. This study examined the onset-offset N1-P2 auditory evoked response in two groups of individuals (one with normal hearing and a second with hearing loss) as a first step in evaluating whether peripheral hearing loss may be more definitively separated from central auditory dysfunction using this objective paradigm. The effects of sensorineural hearing loss on central auditory function are not well understood and diagnosing CAPD in individuals with sensorineural hearing loss remains difficult. The “classic” profile of central auditory processing disorder (CAPD) includes difficulty understanding speech in background noise despite normal audiometric thresholds however, CAPD does not always occur in isolation and is likely under-diagnosed in the hearing loss population. This article concludes with the need of more effort to explore the ways in which auditory system accomplishes these tasks. The mammalian auditory system comprises a highly complex network of interconnected subcortical nuclei and cortical areas designed to extract, encode, and interpret acoustic signals in a dynamic auditory environment. The representation of frequency is a major organizing principle in the auditory system and thus the frequency range is an important influence on the anatomy of the structures in the auditory brain. It focuses on the general plan of organization of the auditory system in mammals, since a major objective in hearing research is to understand the structure and function of the human auditory system, and to identify the causes of, and treatments for, hearing impairment. This article highlights the structural organization of the ascending auditory system. There are a minimum of three relays, several stages of convergence and divergence, and at least seven decussations that make the auditory system unique.
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