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Multiple adaptive processes maintain accurate sound localization following asymmetric hearing loss

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Although the ability to locate sounds is critically important for a wide variety of species, the underlying neural mechanisms do not appear to be hardwired. Instead, the auditory system shows a remarkable capacity to adapt to its acoustical environment. In the past, important insights into this form of sensory plasticity have been gained by studying the effects of chronic unilateral hearing loss. We have recently extended this approach by asking what happens if we induce an intermittent hearing loss in one ear, either in developing ferrets or adult humans. In adult ferrets, we have also begun to use earphones to simulate different forms of abnormal acoustical experience during a sound lateralization task. Together, our results provide insight into how the brain maintains accurate perception despite repeated changes in sensory input over time. Our work also suggests that adaptation in different species may be more similar than was previously thought, which has important implications for rehabilitating individuals with hearing loss.

Peter Keating http://www.auditorybrain.com/

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