# Research digest — 2026-08-18

Automated sweep of the last **45 days**, generated by `scripts/research-watch.py`. Titles and abstracts are arXiv's; anything under *So what* is a maintainer's note, not the authors' claim.

!!! note "No PDFs are hosted here"

    Every entry links to the publisher's copy. We cite work; we do not redistribute it.

**1 new** across 1 topics.

## dysarthric & atypical speech

### [Analyzing Speech Condition Effects in Dysarthric ASR: A Layer-wise Probing Study](http://arxiv.org/abs/2608.01865v2)

*Darwin Jelestin Muthu, Navya Gupta, Wei Lin Tay, Zhengchen Zhang, Daniel Wang Zhengkui, Rong Tong et al. — 2026-08-03*

Automatic speech recognition (ASR) performance degrades sharply on dysarthric speech, yet how disordered articulation reshapes a model's internal representations is underexplored. We conduct a layer-wise probing analysis of a transformer ASR encoder on Mandarin dysarthric speech under three transcript-matched conditions: original dysarthric speech, speaker conditioned zero-shot TTS resynthesis, and unconditioned TTS. Probing reveals a task- and condition-dependent representation hierarchy: phoneme boundary information remains weak across all layers for dysarthric speech; phoneme identity is re…

**So what:** Diagnostic, not a remedy — and that is what makes it useful here. It
probes *where* a transformer encoder loses dysarthric speech, and finds phoneme
**boundary** information weak at every layer while phoneme identity survives further up.
If that holds, it bounds what YazSes's decoder-side levers can do: `initial_prompt`
vocabulary and the disfluency filter operate on tokens that are already downstream of the
loss, so they can fix *spelling* of a recognised word but not a boundary the encoder never
represented. It argues that atypical-speech support is an acoustic-side problem
(padding, VAD, adapters) rather than a post-processing one — which is where
`accessibility.pre_speech_padding_ms` and the dysfluency-friendly mode already sit, and it
suggests the ceiling for that approach.

⚠ **Mandarin, and a probing study, not an intervention.** Transfer to English is unproven
and no WER improvement is claimed, so this belongs in the reasoning behind a design, not
in a claim to a user.