Figure 1. Typical collisions in microgravity.

Records of a single collision upwards (left column) and downwards (right column). The following traces are shown as a function of time: vertical position, velocity and acceleration of the object, load and grip forces, and the vertical gaze position. The left, middle and right cursors are aligned with hand onset (H_onset), peak acceleration (PA) and contact with the target (T_contact) respectively. PV: peak velocity; LF_PA: load force at peak acceleration; GF_M: peak grip force; S_onset, S_land and S_back: saccade to and arrival on the target, saccade onset back to home position.