Systems, devices, and methods for detecting brain conditions from cranial movement due to blood flow in the brain

A system comprising:

• a headset, the headset housing a three-dimensional accelerometer configured to generate three orthogonal signals, each orthogonal signal indicative of acceleration in an axis orthogonal to two other axes of a motion of the three-dimensional accelerometer due to head movement in a brain due to heartbeat;
• an analyzer having an input configured to receive a plurality of data samples based on each orthogonal accelerometer signal, each data sample indicative of the head movement associated with a different heartbeat in a single axis, the analyzer configured to determine a level of chaos of the plurality of data samples and indicate that a large vessel occlusion (LVO) has occurred in the brain when the level of chaos exceeds a threshold,
• wherein the level of chaos is at least partially based on a difference between signal levels at a plurality of selected times of each of a plurality of acceleration versus time functions of the plurality of data samples,
• wherein the level of chaos is at least partially based on a calculation of the plurality of acceleration versus time functions, and
• wherein the calculation comprises determining a difference function for each data sample at a plurality of times, each difference function comprising a difference between the data sample and an average of all data samples.