Accelerometer

Definition: Accelerometer is a device that measures the acceleration caused by movement and gravity, typically in one or more of the three planes of movement and/or three rotational axes. In fNIRS applications, accelerometers can be used to measure the amount, degree, and timing of head and/or body movements during measurement to regress out corresponding motion artifacts from brain hemodynamics.It can also be used to flag potential artifacts for further analysis and/or, in cases when movement is part of the protocol, to relate the type of movement to the measured signal.

Alternative definition:

Synonym: Motion Sensor

References: https://doi.org/10.1016/j.jneumeth.2015.02.006

https://doi.org/10.1117/1.3606576

https://doi.org/10.1016/j.neuroimage.2019.116472

https://doi.org/10.1016/j.neuroimage.2019.06.021

Related terms: motion, movement, motion artifact, movement artifact, gyroscope, Inertial Measurement Unit (IMU), sensor, wearable fNIRS, portable fNIRS, fDCS