DIAGNOSING AUTISM via barely perceptible fluctuations in movement. “The volunteers’ movements were captured using high-speed, high-resolution sensors to track fluctuations in movement invisible to the naked eye. The study also tracked changes in speed and position of the arm at every point in movement, as opposed to a single variable—the top movement of the arm’s velocity—examined in a previously published study from the team. The new motion data strengthens evidence for movement as a biomarker for autism.”