A Preliminary Study on Reaching Position Estimation Model for the Subtle Action Disruption

Abstract

In neuropsychological impairment, micro-error (ME) defines the slight stagnation of movement in reaching actions when the patient is presented with an interference stimulus satisfying the condition around the target stimulus of the reached object. After passing the interfering stimulus, the reaching orbit at the ME-generation point is corrected to the direction of the target stimulus. To identify the interfering stimuli that cause ME, we developed a model that estimates the arrival position in the initial motion time. The reaching position is estimated from the momentum features by a Gaussian-process regression model during two time periods: the time of the velocity waveform peak and the time of the acceleration peak. The coefficients of determination in the acceleration and velocity models were 0.98 respectively, in both the x and z directions. Given the information up to the peak velocity time, the arrival position was estimated to within ± 1 cm.