International Journal For Multidisciplinary Research

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Hidden Hearing Loss (Cochlear Synaptopathy): Diagnostic Challenges and Emerging Tests

Author(s) Mr. Anoop kumar singh, Mr. Ashutosh singh
Country India
Abstract Hidden hearing loss (HHL), often attributed to cochlear synaptopathy, is characterized by difficulty understanding speech in noisy environments despite clinically normal pure-tone thresholds. Moderate noise exposure or aging may destroy synapses between inner hair cells (IHCs) and auditory nerve fibers (ANFs) without hair-cell death, leading to permanent deafferentation [1,2,3]. This neural loss degrades suprathreshold neural coding (e.g., reduced ABR wave I amplitude, impaired envelope-following responses [EFR]) and may manifest as speech-in-noise deficits, tinnitus, or hyperacusis [4,5,6]. However, diagnosing HHL is challenging: standard audiometry is insensitive to synaptopathy, and no consensus diagnostic criteria exist [7,8,9]. Emerging objective measures—reductions in ABR wave I, anomalies in EFR/FFR (frequency-following response), attenuated middle-ear muscle reflexes (MEMR), and altered electrocochleography (ECochG) SP/AP ratios—show promise as biomarkers of synaptopathy [10,11,12,13]. This review covers the neurobiological basis of cochlear synaptopathy, findings from animal and human work, the status of electrophysiological diagnostics (ABR, EFR/FFR, MEMR, ECochG), clinical implications for audiologists and neuroscience researchers, and future directions including standardized test batteries and possible therapies.
Keywords Hidden hearing loss; Cochlear synaptopathy; Auditory nerve; Suprathreshold processing; Auditory brainstem response (ABR); Envelope-following response (EFR); Middle-ear muscle reflex (MEMR); Electrocochleography (ECochG); Diagnostic challenges; Synaptic dysfunction
Published In Volume 7, Issue 6, November-December 2025
Published On 2025-11-05
DOI https://doi.org/10.36948/ijfmr.2025.v07i06.59685
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