Study of a system, as illustrated by the optokinetic response.
D000818:Animals; D003445:Crustacea; D003624:Darkness; D004538:Eidetic Imagery; D005133:Eye Movements; D005246:Feedback; D008027:Light; D009039:Motion Perception; D012160:Retina / Q000033:anatomy & histology; D011984:Sensory Receptor Cells / Q000033:anatomy & histology; D014785:Vision, Ocular / Q000502:physiology*