Inclusion Criteria:  Are age 18-80 years. Are eligible to be scanned using MRI and to undergo audiometry and psychometry. Are able to give informed consent. Must have a good comprehension of English in order to complete the hearing-related questionnaires  Exclusion Criteria:  Pregnant women will be excluded based on MRI safety recommendations. Past medical history of acoustic neuroma and Ménière's disease. Significant past medical history that may affect brain GABA and functional metrics such as stroke, multiple sclerosis, epilepsy, diabetes, cardiovascular, major neurodegenerative or psychiatric conditions, cancer requiring systemic chemotherapy or brain radiotherapy. Individuals who had in last 3 months and/or currently taking a sedating or GABA enhancing or psychoactive drugs (opioids, anti-depressants).