E4 wristband data

Data export and formatting from Empatica Connect

Accessing E4 data: The only way to access data from the E4 is via Empatica's Web Portal, Empatica Connect. The interface allows researchers to visualize E4 session data, download sessions in CSV format, and flag them for permanent deletion.  Study...

Event Marking with the E4 wristband

Event Marking with the E4 allows real-time annotation of a session. Tapping the E4's button (<1 sec) during a session will illuminate the LED light (for 1 sec duration) and deposit a record in the session file of the button press time. Note ...

Publications citing the E3 wristband:

Okruszek, Ł., Dolan, K., Lawrence, M., & Cella, M. (2016). The beat of social cognition: Exploring the role of heart rate variability as marker of mentalizing abilities. Social Neuroscience, 1-5. http://www.tandfonline.com/doi/abs/10.1080/1747...

Recent Publications citing the E4 wristband:

Onton, J. A., Kang, D. Y., & Coleman, T. P. (2016). Visualization of Whole-Night Sleep EEG From 2-Channel Mobile Recording Device Reveals Distinct Deep Sleep Stages with Differential Electrodermal Activity. Frontiers in Human Neuroscience, 10....

Session start-time format and synchronization

How the time is set The time-stamping of data depends on the method of recording. In streaming mode (when you're connected to another device over bluetooth) the time-stamp is derived from the connected device, i.e. and iPhone running the Realtime ...

How is IBI.csv obtained?

The IBI sequence provided by Empatica is obtained from an algorithm that already removes wrong peaks. The picture below depicts a typical situation where the PPG data is corrupted by motion artefacts (graph a). The green points are the good heart...

Utilizing the PPG/BVP signal

The PPG (Photoplethysmography) data is provided by the E4 device. This is also known in the scientific literature as BVP (Blood Volume Pulse).  We suggest you to read the following articles before starting to analyze the BVP data: Pulse oximet...

Have you done comparative studies or validation of the heart rate obtained from the E3?

On E3 continuous heat rate data: The E3 performs admirably when compared to consumer health and fitness devices. It has the advantage of providing continuous heart rate with precise inter beat interval (IBI) information that is not interpolated...

Have you done comparative studies or validation on Electrodermal activity sensor?

On Electrodermal Activity: The E3 samples EDA at 4 Hz in order to support analysis and summarization of phasic changes in the signal. Phasic skin conductance measurements are peaks in the signal that are typically associated with short-term event...

Recommended tools for signal processing and data analysis

Empatica Connect currently offers data visualization but the most powerful insights will come from objective quantification of Empatica data. If you're looking for some tools for signal processing and analysis we can help!For systematic Skin Condu...

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