Eye tracking white sclera (limbus tracking). It presents another challenge for vertical eye movements due to obstruction of eyelids. Eye-tracking setups vary greatly: some are head-mounted, some require the head to be stable (for example, with a chin rest), and some function remotely and automatically track the head during motion. Most use a sampling rate of at least 30 Hz. Although 50/60 Hz is more common, today many video-based eye trackers run at 240, 350 or even 1000/1250 Hz, speeds needed in order to capture fixational eye movements or correctly measure saccade dynamics. Eye movements are typically divided into fixations and saccades
The Tribal Eye The Tribal Eye The Tribal Eye is a seven-part BBC documentary series on the subject of tribal art, written and presented by David Attenborough. It was first transmitted in 1975. This episode centers on the life and customs of the Dogon people in Mali, concentrating primarily on their masks and mask rituals. After a brief introduction to the Dogon culture, the link between African and European art is elaborated upon, using works by Picasso and Braque as examples. Dogon blacksmiths are shown working on a sculpture and a monkey mask for an old woman's funeral; the funeral rites, which include