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


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

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