> For the complete documentation index, see [llms.txt](https://emotiv.gitbook.io/emotivbci/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://emotiv.gitbook.io/emotivbci/motion-sensors/definitions.md).

# Definitions

Motion sensor graphs include 10-axis motion sensors for Insight and EPOC+ headsets:

* Quaternion 0, 1, 2, 3 - quaternion data in X, Y and Z directions and absolute quaternion values
* AccX, AccY and AccZ - accelerometer in X, Y and Z directions
* MagX, MagY and MagZ - magnetometer in X, Y and Z directions

Motion sensor graphs for older Insight and Epoc+ headsets (firmware < 0x633) include 9-axis motion data:

* GyroX, GyroY and GyroZ - gyroscope in X, Y and Z directions
* AccX, AccY and AccZ - accelerometer in X, Y and Z directions
* MagX, MagY and MagZ - magnetometer in X, Y and Z directions