# Page Not Found

The URL `pages/elEh6DvkYLLZaxEd3coG` does not exist. This page may have been moved, renamed, or deleted.

## Suggested Pages

You may be looking for one of the following:
- [2.2. Enhanced Hybrid Brain-Computer Interfaces](https://nguyenngocyennga.gitbook.io/bci/applications/2.2.-enhanced-hybrid-brain-computer-interfaces.md)
- [2.6. Neurocardiology: Cardiovascular and Neurological Disorders](https://nguyenngocyennga.gitbook.io/bci/applications/2.6.-neurocardiology-cardiovascular-and-neurological-disorders.md)
- [2.5. Personalized Health Monitoring and Adaptation](https://nguyenngocyennga.gitbook.io/bci/applications/2.5.-personalized-health-monitoring-and-adaptation.md)
- [2.7. Adaptive Gaming and VR Experience](https://nguyenngocyennga.gitbook.io/bci/applications/2.7.-adaptive-gaming-and-vr-experience.md)
- [2.4. Neurofeedback and Heart Rhythm (Biofeedback) Regulation](https://nguyenngocyennga.gitbook.io/bci/applications/2.4.-neurofeedback-and-heart-rhythm-biofeedback-regulation.md)

## How to find the correct page

If the exact page cannot be found, you can still retrieve the information using the documentation query interface.

### Option 1 — Ask a question (recommended)

Perform an HTTP GET request on the documentation index with the `ask` parameter:

```
GET https://nguyenngocyennga.gitbook.io/bci/applications/2.2.-enhanced-hybrid-brain-computer-interfaces.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

### Option 2 — Browse the documentation index

Full index: https://nguyenngocyennga.gitbook.io/bci/sitemap.md

Use this to discover valid page paths or navigate the documentation structure.

### Option 3 — Retrieve the full documentation corpus

Full export: https://nguyenngocyennga.gitbook.io/bci/llms-full.txt

Use this to access all content at once and perform your own parsing or retrieval. It will be more expensive.

## Tips for requesting documentation

Prefer `.md` URLs for structured content, append `.md` to URLs (e.g., `/bci/applications/2.2.-enhanced-hybrid-brain-computer-interfaces.md`).

You may also use `Accept: text/markdown` header for content negotiation.