Summary of obstacle detection, collision and false reports.

The percentage of obstacle-present trials is reported in which the obstacle was detected, or for which collisions did not occur. The percentage of false reports of the obstacle being present for obstacle-absent trials is also reported. Performance under auditory guidance, SSD guidance, and for the “no-click” control experiment is reported. Under visual guidance, the obstacle was always detected, no collisions occurred, and there were no false reports.