AI Transparency

1. The texts were written by Felix Scheffel

Every symptom text, affirmation and page on bodysignal.app was written by Felix Scheffel. They grew over years out of his own practice, his own research and his own synthesis. Editorial responsibility rests with him, and he stands behind them with his name.

For preparing the material — structuring, search terms, proofreading passes — we use tools of the kind common in any publishing house today. The thinking, the interpretation and the responsibility remain human.

2. The voice is an artificial replica

The spoken versions of the symptom texts are generated with an artificial replica of Felix Scheffel’s voice. Felix Scheffel provided his own voice for this and consented to the replica. These are his texts, read by a model of his voice.

Every recording carries three markers:

• A spoken notice plays before every audio: “Welcome to BodySignal. This audio was generated artificially, using Felix Scheffel’s AI voice.”
• A visible notice sits permanently above the player, in every language.
• On the lock screen and in a car’s media display, the artist reads “Felix Scheffel · AI voice”.

There is no recording on bodysignal.app that passes itself off as Felix Scheffel’s natural voice.

3. The translations are produced by machine

The German original is the authoritative version. Every other language is produced by machine translation from that original, followed by checking passes and sample review. Each translated symptom text carries a notice at the start of the text.

Where a translation and the German original differ, the German original prevails. If a passage strikes you as odd, write to us — every report improves the collection.

4. The legal framework

Article 50 of Regulation (EU) 2024/1689 on artificial intelligence requires the deployer of an AI system that generates image, audio or video content to disclose that the content has been artificially generated or manipulated. The information must be provided in a clear and distinguishable manner, at the latest at the time of the first interaction or exposure. This obligation has applied since 2 August 2026.

The markers on this page and in the app implement that obligation. Should the legal framework change, this page will be updated; the date above shows its current state.

5. Questions about this

If you want to know how a particular piece of content came about, ask us. We answer concretely.

To the contact form

The other direction: what AI systems and third parties may do with BodySignal content is set out in the AI and citation licence.

To the AI licence