Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2021 Jul 28;5(7):e23229. doi: 10.2196/23229

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

©Sigrid Hegna Ingvaldsen, Erling Tronvik, Eiliv Brenner, Ingunn Winnberg, Alexander Olsen, Gøril Bruvik Gravdahl, Anker Stubberud. Originally published in JMIR Formative Research (https://formative.jmir.org), 28.07.2021.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in JMIR Formative Research, is properly cited. The complete bibliographic information, a link to the original publication on https://formative.jmir.org, as well as this copyright and license information must be included.

PMC Copyright notice

App screenshots. Left: Sample question in the headache diary where users are asked to rate headache intensity (On average, how intense was your headache during the day?). Center left: Instructions on how to connect the sensors. Center right: Visualization during the biofeedback session. Each of the three parameters is displayed as a horizontal column increasing in width with increasing score and correspondingly changing color. Right: Headache diary overview allowing for easy visualization of previous headache diary entries.