Twenty children with ASD (18 males) without accompanying intellectual impairment and twenty typically developing children (TD group: 16 males) were recruited from the Child neuropsychiatry Unit of the IRCCS Giannina Gaslini Hospital and primary schools in Genova.
Children were seated on a height-adjustable chair, with their right elbow and wrist resting on a table (height = 64 cm; length = 100 cm; width = 60 cm). A plastic bottle filled with water (base diameter= 5 cm; height = 18 cm; weight = 225 g) was positioned on the table at a distance of 44 cm from children's midline. Children were instructed to reach towards and grasp an object (a bottle) to place it into a box (grasp-to-place), to pour some water into a glass (grasp-to-pour), or to pass the bottle to a co-actor (grasp-to-pass), who would then either place the bottle into the box (pass-to-place) or pour some water (pass-to-pour). Children performed a series of 12 consecutive grasps for each condition, making a total of 48 movements. On each trial, children were asked to perform the movement at a natural speed after an auditory tone.
Movements were filmed from a lateral viewpoint using a Vicon VUE video camera (resolution: 1280 x 720 pixels, 100 frames/sec). The video sequences are exactly trimmed at the instant when the hand grasps the bottle, removing the following part. The videos result very short, the average length is 83 frames. We discard the corrupted acquisitions, collecting a final dataset based on 1837 video sequences.