These clips show Cog orienting its head and neck to a visual stimulus. The eyes are moving to look at moving objects in the field of view. Whenever the eyes move to their new target, the neck moves to point the head toward that same target. The first clip is from the second revision of Cog's head.
Human eyes move as the result of one of four mechanisms.
The saccadic movements are high-speed movements that cause the eye to jump to a new location approximately three times per second This short clip shows the first tests of the new active vision system as it saccades to random positions. Three of these heads were developed, one for Cog, and two to serve as desktop development platforms. The eyes are travelling at about one-half their maximum velocity. In this clip, Cog has been programmed to attend to moving objects. This motion detection operates by subtracting consecutive images, and the using region growing to identify boundaries of moving objects.