How Extended High-Frequency Amplification Affects Word Learning in Children Andrea Pittman, Ph.D. Arizona State University Dawna Lewis, M.S. Brenda Hoover,

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How Extended High-Frequency Amplification Affects Word Learning in Children Andrea Pittman, Ph.D. Arizona State University Dawna Lewis, M.S. Brenda Hoover, M.S. Pat Stelmachowicz, Ph.D. Boystown National Research Hospital Funded by grants from NIH-NIDCD

Background Combination of two previous studies Bandwidth and perception Word learning and hearing loss Purpose To determine the affect of bandwidth on word learning in normal-hearing and hearing-impaired children Standard bandwidth - 4 kHz Extended bandwidth - 9 kHz

Novel-Word Construction Place Manner Plosive Nasal Fricative Approximate Lateral Approximate Bilabial Labio- dental DentalAlveola Post Alveola PalatalVelarGlottal pbtdkg fvT  szSZ mnN r lw hC  j

Novel-Word Construction pbtdkg fvT  szSZ mnN r lw hC  j

p b t d k g f v T  s z S Z m n N rl w hC  j a I uQ i I o I i o I i I a i u u I

bayrillvojing youzzapzeekin deewimtathus thogishhoochiff

Novel-Word Construction bayrillvojing youzzapzeekin deewimtathus thogishhoochiff

Story Construction

Filtering Low-pass filtered the words at 4 & 9 kHz bayrill youzzap deewim thogish 4 kHz9 kHz vojing zeekin tathus hoochiff

Filtering Low-pass filtered the words at 4 & 9 kHz Created two stories bayrill youzzap deewim thogish 4 kHz9 kHz vojing zeekin tathus hoochiff

bayrill youzzap deewim thogish Filtering Low-pass filtered the words at 4 & 9 kHz Created two stories bayrill youzzap deewim thogish 4 kHz9 kHz Story 1 Story 2 vojing zeekin tathus hoochiff vojing zeekin tathus hoochiff Presented to separate groups of children Group 1 Group 2

Story Presentation Low-pass filtered half the words at 4-kHz and half at 9-kHz Each word was presented 3 times The 4-minute story was presented twice before testing Word-learning parameters 8 words 6 presentations each 8 minute period

Participants 97 Children between 5- and 14-years-old 60 Normal Hearing (mean age: 9yrs, SD: 2yrs) 37 Hearing Impaired (mean age: 9yrs, SD: 2yrs) Estimated receptive vocabulary (PPVT III)

Results

Normal-Hearing Children

Results Hearing-Impaired Children

Conclusions On average, performance improved slightly in the extended bandwidth condition for both groups Both groups demonstrated more consistent word learning in the extended bandwidth condition Consistent word learning was more apparent for the children with hearing loss

Amplification Frequency shaping was calculated for each child using DSL Sensation levels were confirmed for each bandwidth condition

Results

Background The effect of stimulus bandwidth on the perception of /s/ in normal- and hearing- impaired children and adults (Stelmachowicz, Pittman, Hoover, & Lewis 2001)

Background Novel-word learning in normal-hearing and hearing-impaired children (Stelmachowicz, Pittman, Lewis, Hoover 2004)