Abstract
Objective The aim was to create and validate an audiovisual version of the German matrix sentence test (MST), which uses the existing audio-only speech material. Design Video recordings were recorded and dubbed with the audio of the existing German MST. The current study evaluates the MST in conditions including audio and visual modalities, speech in quiet and noise, and open and closed-set response formats. Sample One female talker recorded repetitions of the German MST sentences. Twenty-eight young normal-hearing participants completed the evaluation study. Results The audiovisual benefit in quiet was 7.0 dB in sound pressure level (SPL). In noise, the audiovisual benefit was 4.9 dB in signal-to-noise ratio (SNR). Speechreading scores ranged from 0% to 84% speech reception in visual-only sentences (mean = 50%). Audiovisual speech reception thresholds (SRTs) had a larger standard deviation than audio-only SRTs. Audiovisual SRTs improved successively with increasing number of lists performed. The final video recordings are openly available. Conclusions The video material achieved similar results as the literature in terms of gross speech intelligibility, despite the inherent asynchronies of dubbing. Due to ceiling effects, adaptive procedures targeting 80% intelligibility should be used. At least one or two training lists should be performed.
Highlights
Speech audiometry is an essential element in audiology [1][2]
Speechreading scores ranged from 0% to 84% speech reception in visual-only sentences
Our second contribution is the evaluation of the AV-OLSAf with normalhearing listeners in different conditions: we show the audiovisual training effects in the open-set and closed-set responses; we discuss the speechreading scores and the effects of speechreading in the audiovisual speech reception thresholds (SRTs); and we compare the audio-only and audiovisual SRTs in noise and in quiet conditions
Summary
Speech audiometry is an essential element in audiology [1][2]. It assesses the ability to understand speech acoustically, which is crucial for human communication. The matrix sentence test (MST) [45] is a well-established method in speech audiometry, and it exists in several languages [3]. MSTs use sentences of 5 words with a "noun - verb - number - adjective - object" structure. There are 10 possible words for each word category (e.g., 10 nouns, 10 verbs, etc.); these are combined to create semantically unpredictable, syntactically correct sentences. Lists of 20 sentences are commonly used to test speech intelligibility
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