Aging & Making Sense of Sound
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1 Aging & Making Sense of Sound Nina Kraus, Ph.D.
2 Disclosures Current funding: NIH, Dana Foundation, Med-EL, NAMM Other financial relationships: Equity in Synaural, Inc., a company working to develop a user-friendly measure of auditory processing. Conflicts of interest: None
3 Aging and Making Sense of Sound EAR presbycusis hair cell damage synaptopathy BRAIN central hearing loss Action: feed the brain the best signal from the ear Action: activities to promote CNS strength and plasticity Factors that make an older adult successful at hearing in noise
4 SOUND
5 Attributes of a seen object Shape sphere Dimensionality 3D Color yellow Solidity yes Pattern none Movement no Transparency no Texture fuzzy
6 Attributes of sound Pitch high Intensity loud Timbre crunchy Consonance dissonant Timing fast Location straight ahead Attack gradual Movement left to right
7 Auditory Processing Speed < 1 ms! Left Ear Auditory Brain Right Ear
8 Auditory system Cochlea CN SOC NLL IC MGB Aud. Cortex visual system Retina lateral geniculate Vis. Cortex connectivity to non-auditory centers Malmierca, Encycl Comput Neurosci 2015
9 Making sense of sound Kraus & White-Schwoch, Trends Cog Sci, 2015
10 Normal Inner Ear Auditory Nerve To Brain
11 Damaged Hair Cells and Synapse Damaged Hair Cells Damaged Synapse Auditory Nerve To Brain Kujawa & Liberman J Neurosci 2009
12 Take ear and brain into account Individualized biological data
13 db db otoacoustic emissions Hz khz audiometry WIN
14 AGING CONCUSSION HEARING IN NOISE
15 Better hearing in noise Hearing in Noise engages Cognition Working memory Moore et al., 2014, PLoS ONE
16 Hearing in Noise Hearing in Noise Sound Processing in the Brain Normal Hearing Thresholds -4 Excellent Poor 12 Adults with normal hearing thresholds Time (ms)
17 Amplitude (µv) Hearing in Noise Wors e Better Hearing in Noise Sound Processing in the Brain Hearing Loss Good Quiet Poor Quiet Time (ms) Older Adults - Hearing Loss
18 .1 COGNITION Memory Attention HEARING IN NOISE SOUND PROCESSING in the BRAIN Pitch, Timing, Harmonics LIFE EXPERIENCES Music Exercise EAR Audiogram OAEs Anderson et al (2013) Hear Res
19 Biological Aging Breakdown in timing Reduced inhibition Increased spontaneous activity Broader spatial tuning Reduced cortical connectivity for spatial processing late early old young neural timing Anderson et al, J Neursoci 2012 Caspary et al., J Exp Biol 2008 Engle & Recanzone, Front Aging Neurosci 2013 Recanzone et al, Hear Res 2011 Juarez-Salinas et al, J Neurosci 2010
20 Biological Aging & Hearing Loss Compensatory neurochemistry protein expression Reduced inhibition throughout auditory pathway Reorganization of auditory and visual areas Sharma & Glick Brain Sciences Gray et al. J Comp Neurol, 2013; 2014 Engle & Recanzone, Front Aging Neurosci 2013 Overton & Recanzone J Neurophysiol 2016
21 Cognition Hearing loss impacts cognition Normal Hearing Hearing Loss Age accelerates aging Lin et al. (2013) JAMA Int Med Lin et al. (2014) Neuroimage
22 Feed the brain the best input possible
23 Frequency (Hz) Hearing aid/device fitting informed by biology Anderson et al. (under review) Unaided Amplification boosts neural synchrony Aided Time (ms)
24 Hearing device/processing strategy Automated Fitting Collect EEG to dozens of algorithms to find the best fit for the brain That s the one!
25 AGING HEALTHY AGING
26 STRENGTHENING SOUND PROCESSING Lifelong Initiated later in life
27 Cognition Bilingual Age Monolingual strengthens sound processing consequences for hearing in noise Krizman et al. PNAS 2012 Krizman et al. Biling: Lang & Cogn 2016 Bialystok et al. (2014) Psychol Aging Bak et al. (2014) Ann Neurol Guzmán-Vélez & Tranel (2015) Neuropsychol
28 MUSIC MUSIC & HEARING IN NOISE COGNITIVE, SENSORIMOTOR, REWARD
29 *** HEARING IN NOISE non-musicians musicians quiet *** noise review: Kraus & White-Schwoch, Neuroscientist, 2016
30 db SNR Fo Initiated later in life Listening in noise ** Neural response to sound * pre post pre post Russo, 2016, WCA Ryerson University; Neuromusic 2017
31 Initiated later in life 75 older adults Brain Fitness Program Pre-Testing Post-Testing Educational Videos Anderson et al. PNAS, 2013 Anderson et al. Front Sys Neurosci 2013
32 Better db Initiated later in life pre-training post-training Hearing in Noise Biology ** ** late early controls Brain Fitness neural timing All subjects Hearing loss Anderson et al. PNAS, 2013 Anderson et al. Front Syst Neurosci, 2013 Caspary Ear and Hearing
33 Neural sound processing Biological Aging is Individual Skoe et al., Cerebral Cortex, 2015 Gray and Recanzone Evolution of Nervous System 2017
34 Summary Nurture Eyes and Ears for healthy aging Biology can inform training strategies, individualized care Gaps How does auditory aging begin? presbycusis? hair cell damage? synaptopathy? central hearing loss? combined effect of auditory and visual impairment? What factors make an older adult successful at hearing in noise?
35 whole person care
36
37 Demonstration Our Biological Approach
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