Sennheiser E 945 - 03-06 User Manual download pdf (Page 147)

Deutsche Gesellschaft für auDioloGie e. V.292 293

AbstrActs

18. JAhrestAgung „MultidisziplinArität in der Audiologie“

Beitrag wird präsentiert am 07.03.2015 um 11.42 Uhr im Rahmen der FV15

Objective estimation of low frequency hearing thresholds with ASSR and SN10

M. Höfer, T. Lenarz, S. Haumann

HNO-Klinik, Medizinische Hochschule Hannover

The preservation of residual hearing is essential for cochlear implant (CI) recipients as it pro-

vides a better listening experience. Two possible methods to objectively quantify low frequen-

cy thresholds are SN10 and ASSR. Compared to the SN10 the ASSR has several advantages:

estimation of frequency speciﬁc thresholds from 0.5 to 4 kHz simultaneously and binaurally,

objective analysis. Until now ASSR-based thresholds have not been compared to SN10-based

thresholds. The goal of the study is the comparison of low frequency thresholds measured

with both methods in children.

For 19 children (1-9 years) the threshold at 500 Hz was measured using ASSR and SN10. Re-

gression coefﬁcients and linear regression were calculated for ASSR and SN10 thresholds,

separately for the left (n=11) and right ear (n=12). In cases where no threshold was measureable

the patient was excluded from the analysis.

The mean thresholds for ASSR were 57.3±18.5 (L), 61.8±27.5 (R) and for SN10 61.7±24.4 (L),

57.5±24.2 dB (R). The linear regression was found to be signiﬁcantly different from zero on

both sides (L: T=2.778, p<.05; R: T=3.909, p<.01). Further, the ASSR-based thresholds corre-

lated signiﬁcantly with the SN10-based thresholds (L: r=.777, p<.01; R: r=.679, p<.05).

Given the good ﬁt and signiﬁcant correlation of the thresholds we can assume that ASSR is at

least as good as the SN10 to quantify low frequency thresholds. The opportunity to measure

several frequencies simultaneously and binaurally makes ASSR a good candidate as a regular

clinical application.

This work was supported by the cluster of excellence Hearing4all (EXC 1077).

Beitrag wird präsentiert am 07.03.2015 um 11.45 Uhr im Rahmen der FV15

Inﬂuence of attention on speech-rhythm evoked potentials: ﬁrst steps towards an

auditory brain-computer-interface driven by speech.

C. da Silva Souto, H. Lüddemann, S. Lipski, M. Dietz, B. Kollmeier

Medizinische Physik and Cluster of Excellence „Hearing4all“ Universität Oldenburg, PhD

Program Signals and Cognition

A Brain-computer interface (BCI) uses neuronal responses to control external systems. The

majority of BCI systems are based on visual stimuli, only few apply auditory input. Because

auditory-based BCIs do not rely on visual skills or mobility of the body, they could be an alter-

native for visible or physical disabled people.

This study investigates the performance of an auditory paradigm using two competing streams

of repeatedly presented speech syllables. The streams had different repetition rates of 2.3 and

3.1 Hz. Our auditory BCI approach uses the auditory steady-state response (ASSR) to auto-

matically detect to which stream a listener selectively attends to.

In a single trial classiﬁcation ten healthy volunteers achieved a signiﬁcant above chance ac-

curacy of 60 % and an information transfer-rate (ITR) of 0.2 bit/min. Using the average over

six random trials improved the average classiﬁcation accuracy to 80 % by keeping the ITR

comparable.

In conclusion it is possible to classify ASSR evoked from streams of spoken syllables. The per-

formance of this auditory BCI is not yet effective enough for a real life application, but is a step

towards the long term goal of using BCIs on natural speech features and eventually controlling

the processing of hearing devices.

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