Multiple Auditory Steady-State Response Thresholds to Bone-Conduction Stimuli in Young Infants with Normal Hearing

Small, Susan A.; Stapells, David R.

doi:10.1097/01.aud.0000215974.74293.b9

Cited by 61 publications

(71 citation statements)

References 21 publications

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“…No significant differences were found for ASSR threshold between the temporal bone and mastoid bone oscillator placements. Consistent with our results reported in a previous study (Small & Stapells, 2006), boneconduction ASSR thresholds in preterm infants were significantly lower (i.e., better) at 500 and 1000 Hz compared with 2000 and 4000 Hz.…”

Section: Resultssupporting

confidence: 83%

“…Bone-conduction ASSR amplitudes at 30 dB HL for 500 and 1000 Hz and at 40 dB HL for 2000 and 4000 Hz were compared across frequency and coupling condition. A greater intensity was selected for 2000 and 4000 Hz than for 500 and 1000 Hz to compensate for poorer thresholds (approximately 10 dB) at these higher frequencies (Small & Stapells, 2006). Statistical analyses • A 2-way repeated-measures ANOVA was performed comparing ASSR thresholds for 10 infants at 500, 1000, 2000 and 4000 Hz between coupling methods (elastic-band and hand-held).…”

Section: Ear and Hearing / February 2007mentioning

confidence: 99%

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Effects of Bone Oscillator Coupling Method, Placement Location, and Occlusion on Bone-Conduction Auditory Steady-State Responses in Infants

2007

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Objective: The aim of these experiments was to investigate procedures used when estimating boneconduction thresholds in infants. The objectives were: (i) to investigate the variability in force applied using two common bone-oscillator coupling methods and to determine whether coupling method affects threshold estimation, (ii) to examine effects of bone-oscillator placement on bone-conduction ASSR thresholds, and (iii) to determine whether the occlusion effect is present in infants by comparing bone-conduction ASSR thresholds for unoccluded and occluded ears.Design: Experiment 1A: The variability in the amount of force applied to the bone oscillator by trained assistants (n ‫؍‬ 4) for elastic-band and handheld coupling methods was measured. Experiment 1B: Bone-conduction behavioral thresholds in 10 adults were compared for two coupling methods. Experiment 1C: ASSR thresholds and amplitudes to multiple bone-conduction stimuli were compared in 10 infants (mean age: 17 wk) using two coupling methods. Experiment 2: Bone-conduction ASSR thresholds and amplitudes were compared for temporal, mastoid and forehead oscillator placements in 15 preterm infants (mean age: 35 wk postconceptual age (PCA)). Experiment 3: Bone-conduction ASSR thresholds, amplitudes and phase delays were compared in 13 infants (mean age: 15 wk) for an unoccluded and occluded test ear. All infants that participated had passed a hearing screening test.Results: Experiment 1A: Coupling method did not significantly affect the variability in force applied to the oscillator. Experiment 1B: There were no differences in adult bone-conduction behavioural thresholds between coupling methods. Experiment 1C: There was no significant difference between oscillator coupling method or significant frequency x coupling method interaction for ASSR thresholds or amplitudes in the young infants tested. However, there was a nonsignificant 9-dB better threshold at 4000 Hz for the elastic-band method. Experiment 2: Mean bone-conduction ASSR thresholds for the preterm infants were not significantly different for the temporal and mastoid placements. Mean ASSR thresholds for the forehead placement were significantly higher compared to the other two placements (12-18 dB higher on average). Mean ASSR amplitudes were significantly larger for the temporal and mastoid placements compared to the forehead placement. Experiment 3: There was no difference in mean ASSR thresholds, amplitudes or phase delays for the unoccluded versus occluded conditions. Conclusions:Trained assistants can apply an appropriate amount of force to the bone oscillator using either the elastic-band or hand-held method. Coupling method has no significant effect on estimation of bone-conduction thresholds; therefore, either may be used clinically provided assistants are appropriately trained. For preterm infants, there are no differences in ASSRs when the oscillator is positioned at the temporal or mastoid placement. However, thresholds are higher and amplitudes are smaller for the forehead placement, consequ...

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Section: Resultssupporting

confidence: 83%

Section: Ear and Hearing / February 2007mentioning

confidence: 99%

Effects of Bone Oscillator Coupling Method, Placement Location, and Occlusion on Bone-Conduction Auditory Steady-State Responses in Infants

2007

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“…For infants, mean ASSR thresholds were 13 to 15 dB poorer for ASSRs recorded in the contralateral EEG channel compared with those in the ipsilateral EEG channel; the channel effect was statistically significant [F(1,10) ϭ 34.468, p ϭ 0.0002]. There was a significant effect of frequency [F(3,30) ϭ 5.046, p ϭ 0.006], similar to results reported in our previous studies (Small & Stapells, 2006; submitted for publication); however, no significant interaction between EEG channel and frequency [F(3,30) ϭ 0.759, p ϭ 0.526] was found. For adults, there was no difference between mean ASSR thresholds for responses recorded in the contralateral or ipsilateral EEG channels [F(1,14) ϭ 0.028, p ϭ 0.869].…”

Section: Assr Thresholdsupporting

confidence: 80%

“…Our recent studies were the first to estimate bone-conduction thresholds in infants using multiple ASSRs Small & Stapells, 2006). The results of these studies showed that it is possible to record bone-conduction ASSRs to multiple stimuli in pre-and postterm infants with normal hearing and revealed differences in bone-conduction thresholds between two infant groups compared with adults.…”

Section: Discussionmentioning

confidence: 96%

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Normal Ipsilateral/Contralateral Asymmetries in Infant Multiple Auditory Steady-State Responses to Air- and Bone-Conduction Stimuli

Small

Stapells

2008

Ear &Amp; Hearing

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Objectives: Two-channel recordings of infants' airand bone-conduction auditory brainstem responses to brief tones show ipsilateral and contralateral (to the stimulated ear) asymmetries which may be used to isolate which cochlea is the primary contributor to the response. The objective of this study was to determine whether similar ipsilateral/contralateral asymmetries are also present in the air-and boneconduction "brainstem" (77 to 101 Hz) auditory steady-state responses (ASSRs) of infants.Design: Two-channel ASSRs were recorded in infants (2 to 11 mo) and adults (18 to 40 yr) with normal hearing. Multiple stimuli (carrier frequencies: 500 to 4000 Hz; amplitude/frequency modulated) were presented using a B-71 oscillator on the temporal bone or an ER3-A insert earphone. Bone-conduction ASSR amplitudes, phase delays, and thresholds were obtained for the electroencephalographic (EEG) channels ipsilateral and contralateral to the oscillator temporal-bone placement. Bone-conduction ASSRs were also obtained to the stimulus presented to the opposite temporal bone (at 40 dB HL only). Airconduction ASSR amplitudes and phase delays were obtained at 60 dB HL in each ear for the EEG channels ipsilateral and contralateral to the transducer.Results: Infants showed more ipsilateral/contralateral asymmetries in both air-and bone-conduction ASSRs compared with adults. Mean bone-conduction ASSR thresholds in infants were 13 to 15 dB higher (i.e., poorer) in the contralateral EEG channel compared with the ipsilateral EEG channel for 500 to 4000 Hz. In adults, there were no large differences (i.e., within 1 dB) between ipsilateral and contralateral ASSR thresholds. Based on ipsilateral/ contralateral threshold differences in infants, interaural attenuation for bone-conducted stimuli was estimated to be at least 10 to 30 dB for most infants. In contrast, most adults showed little interaural attenuation for bone-conducted stimuli.ASSR amplitudes are larger and phase delays are shorter in the ipsilateral EEG channel. For infants, the difference in air-conduction ASSR amplitude between EEG channels was twice that observed for adults. Infants also had greater ASSR amplitude differences between EEG channels for bone-conduction stimuli compared with adults, but the difference was less than that seen for air-conduction stimuli. For air-conduction stimuli, infants had significantly longer phase delays in the contralateral EEG channel compared with the ipsilateral EEG channel. Adults showed no significant differences in air-conduction ASSR phase delay between EEG channels. For bone-conduction stimuli, both infants and adults had significantly longer phase delays in the contralateral EEG channel compared with the ipsilateral EEG channel; the differences in ASSR phase delays between EEG channels were much smaller in infants compared with adults and fewer adults had absent responses in the contralateral EEG channels compared with infants (12% versus 34%). When the transducers were switched to the opposite ear/mastoid, the infant and adult ipsi...

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Akustisch evozierte Potenziale (AEP)

Walger

Hoth

Mühler

2014

Objektive Audiometrie Im Kindesalter

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Multiple Auditory Steady-State Response Thresholds to Bone-Conduction Stimuli in Young Infants with Normal Hearing

Cited by 61 publications

References 21 publications

Effects of Bone Oscillator Coupling Method, Placement Location, and Occlusion on Bone-Conduction Auditory Steady-State Responses in Infants

Effects of Bone Oscillator Coupling Method, Placement Location, and Occlusion on Bone-Conduction Auditory Steady-State Responses in Infants

Normal Ipsilateral/Contralateral Asymmetries in Infant Multiple Auditory Steady-State Responses to Air- and Bone-Conduction Stimuli

Akustisch evozierte Potenziale (AEP)

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