On the Difficulty of Token-Level Modeling of Dysfluency and Fluency Shaping Artifacts

• URL: http://arxiv.org/abs/2512.02027v1
• Date: Tue, 18 Nov 2025 19:33:29 GMT
• Title: On the Difficulty of Token-Level Modeling of Dysfluency and Fluency Shaping Artifacts
• Authors: Kashaf Gulzar, Dominik Wagner, Sebastian P. Bayerl, Florian Hönig, Tobias Bocklet, Korbinian Riedhammer,
• Abstract summary: Dysfluencies and fluency-shaping artifacts are often overlooked, resulting in non-verbatim transcriptions with limited clinical and research value.<n>We propose a parameter-efficient adaptation method to decode dysfluencies and fluency modifications as special tokens within transcriptions.<n>Our findings demonstrate the effectiveness of lightweight adaptation techniques for dysfluency-aware ASR.
• Score: 21.253980895817634
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Automatic transcription of stuttered speech remains a challenge, even for modern end-to-end (E2E) automatic speech recognition (ASR) frameworks. Dysfluencies and fluency-shaping artifacts are often overlooked, resulting in non-verbatim transcriptions with limited clinical and research value. We propose a parameter-efficient adaptation method to decode dysfluencies and fluency modifications as special tokens within transcriptions, evaluated on simulated (LibriStutter, English) and natural (KSoF, German) stuttered speech datasets. To mitigate ASR performance disparities and bias towards English, we introduce a multi-step fine-tuning strategy with language-adaptive pretraining. Tokenization analysis further highlights the tokenizer's English-centric bias, which poses challenges for improving performance on German data. Our findings demonstrate the effectiveness of lightweight adaptation techniques for dysfluency-aware ASR while exposing key limitations in multilingual E2E systems.

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