title: Altered temporal dynamics of neural adaptation in the aging human auditory cortex.
abstract: Neural response adaptation plays an important role in perception and cognition. Here, we used electroencephalography to investigate how aging affects the temporal dynamics of neural adaptation in human auditory cortex. Younger (18-31 years) and older (51-70 years) normal hearing adults listened to tone sequences with varying onset-to-onset intervals. Our results show long-lasting neural adaptation such that the response to a particular tone is a nonlinear function of the extended temporal history of sound events. Most important, aging is associated with multiple changes in auditory cortex; older adults exhibit larger and less variable response magnitudes, a larger dynamic response range, and a reduced sensitivity to temporal context. Computational modeling suggests that reduced adaptation recovery times underlie these changes in the aging auditory cortex and that the extended temporal stimulation has less influence on the neural response to the current sound in older compared with younger individuals. Our human electroencephalography results critically narrow the gap to animal electrophysiology work suggesting a compensatory release from cortical inhibition accompanying hearing loss and aging.
authors.affiliation: Department of Psychology, The Brain & Mind Institute, The University of Western Ontario, London, Ontario, Canada; Max Planck Research Group "Auditory Cognition", Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Germany. Electronic address: herrmann.b@gmail.com.
authors.forename: Björn
authors.initials: B
authors.lastname: Herrmann
authors.affiliation: Department of Psychology, The Brain & Mind Institute, The University of Western Ontario, London, Ontario, Canada; Max Planck Research Group "Auditory Cognition", Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Germany.
authors.forename: Molly J
authors.initials: MJ
authors.lastname: Henry
authors.affiliation: Department of Psychology, The Brain & Mind Institute, The University of Western Ontario, London, Ontario, Canada; School of Communication Sciences & Disorders, The University of Western Ontario, London, Ontario, Canada.
authors.forename: Ingrid S
authors.initials: IS
authors.lastname: Johnsrude
authors.affiliation: Max Planck Research Group "Auditory Cognition", Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Germany; Department of Psychology, University of Lübeck, Lübeck, Germany.
authors.forename: Jonas
authors.initials: J
authors.lastname: Obleser
mesh_terms: D000161:Acoustic Stimulation; D000220:Adaptation, Biological / Q000502:physiology*; D000293:Adolescent; D000328:Adult; D000368:Aged; D000375:Aging / Q000502:physiology*; D001303:Auditory Cortex / Q000502:physiology*; D001307:Auditory Perception / Q000502:physiology; D004569:Electroencephalography; D005260:Female; D034381:Hearing Loss / Q000209:etiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D009433:Neural Inhibition / Q000502:physiology; D055815:Young Adult
keywords: Aging; Electroencephalography; Neural adaptation; Temporal context