Grinn Hearing Lab

The Grinn Hearing Lab is committed to developing a model that accurately predicts individual susceptibility to noise-induced hearing loss (NIHL) to better identify and protect high-risk populations. The Grinn Hearing Lab collaborates with the CMU Hearing Conservation Program and the CMU College of Music to prevent occupational and recreational hearing loss on campus and in the community.

A Central Michigan University audiology student looks into the ear of a person wearing a virtual reality device over their eyes

Research projects

Temporary hearing changes following recreation virtual-reality (VR) music concert

Temporary threshold shift refers to reduced hearing sensitivity following noise exposure, which then recovers fully within 24 hours. Noise-induced cochlear synaptopathy refers to lasting permanent damage to the synaptic connections between the inner hair cells and auditory nerve dendrites following a severe, temporary threshold shift. It has become clear that not every noise exposure that induces temporary threshold shift will result in cochlear synaptopathy. Less is known about the effects of slight (0-10 dB HL), rather than severe, temporary threshold shifts in humans, be it changes in cochlear nerve response or hearing-in-noise performance. This study analyzed slight, temporary hearing sensitivity changes after viewing a music exposure that is quantifiably a low noise risk: a 90 min live music concert using a commercially available virtual-reality (VR) headset. 


  • Grinn, S., Garozzo, J., Notaro, D., Saxon, R., Shokar, J. Cochlear Nerve Response Following Acute Recreational Music Exposure (in preparation).
  • Grinn, S., Trevino, M., Lobarinas, E. (2022). Noise-induced Threshold Shift Susceptibility Correlated with Pre-Cochlear Amplification in Chinchilla (under review).
  • Grinn, S. & Le Prell, C.G. (2022). Evaluation of Hidden Hearing Loss in Normal-Hearing Firearm Users. Frontiers in Neuroscience, 16.
  • Grinn, S. & Le Prell, C.G. (2021). Modeling Individual Noise-Induced Hearing Loss Risk with Proxy Measurements of External-Ear Amplification. The Journal of the Acoustical Society of America, 149(6), 3975-3987.
  • Grinn, S. & Le Prell, C.G. (2019). Noise-dose estimated with and without Pre-cochlear Amplification. The Journal of the Acoustical Society of America, 146(5), 3967-3977.
  • Grinn, S., Wiseman, K. B., Baker, J. A., & Le Prell, C. G. (2017). Hidden hearing loss? No effect of common recreational noise exposure on cochlear nerve response amplitude in humans. Frontiers in Neuroscience, 11, 465.