This app tracks any subjective magnitude (e.g. pleasure) over time. The participant keeps the tips of two fingers on the smartphone screen, and reports magnitude by finger spread over time. The app takes a reading every second (or any rate you like), converts each analog spread into a numerical rating, and, at the end of the trial, emails the data as a spreadsheet file (.CSV) to the experimenter (you). You can use the app with virtually any stimulus – music, art, video, live performance, or even discussion.
The app can present music from spotify, selected by the participant. However, this is data-intense and our Spotify license only allows us to serve one user at a time, in the whole world.
Who can use it?
With this app, you can collect data on any touchscreen device (iOS or Android) with internet access, including iPhone, iPad, and Samsung Galaxy. Anyone can use it. It's free. If you publish your data, please cite us. (See credit page for full citation.)
What features can I change?
You can set the duration, feedback, calibration details, and your email address, to which the data file will be sent. [Soon, you will be able to select the name for the magnitude (emotion) that the participant will be asked to report, e.g. "pleasure" or "anxiety".] You edit the settings by clicking on the gear icon on the home screen.
Group data for lecture or classroom demonstration
For lecture use, a group data feature (under development) collects data from multiple observers during the same session (e.g. everyone watching a movie), each responding through their own device. Our server provides a data page from which you can request a summary data file that summarizes all the data files on the server for a particular experiment and time window. All the data files are aligned by absolute time before the summary is made. Saving data on the server is optional. It is only needed to get a group data summary. Your data belong to you. emotiontracker.com/data
Denis G. Pelli, December 6, 2014
Measure self-reported emotion over time. Currently supports Safari and Chrome browsers on iOS and Android devices. Support for other devices may be added. Let us know what you need. firstname.lastname@example.org