Fastrak motion tracker

A. Experiment and data 24 ASC (9 female, age 31.5 years) and 22 TD (7 female, age 30.8 years) IQ matched participants performed a simple pointing task. Two 8 mm diameter red stickers were attached 30 cm apart on the horizontal surface of a table in front of seated participants who were instructed: "With your index finger point between these two targets as quickly and as accurately you can". The task was performed with dominant and non-dominant hand. Polhemus Fastrak motion tracker was used for kinematic data collection with a single motion sensor attached to the distal phalange of the index finger. Movement was sampled at 120 Hz in X, Y, Z coordinates and features based on velocity, acceleration, jerk and amplitude were calculated for each pointing movement (Table I). In addition, accuracy features were calculated based on the area bounded by points where the finger touched the horizontal surface when performing targeted movements to sticker locations (Fig. 1a) and by the average distance between all points (Fig. 1b). In total there were 60 features which were means and standard deviations (SDs) calculated by pooling movements performed with dominant and non-dominant hands. The experimental procedures involving human subjects described in this paper were approved by the University of Manchester research ethics committee, ref: 2017-2541-4204.