Types of gaze movement: Variable interactions of eye and head movements
Zangemeister WH and LW Stark. Experimental Neurology Volume 77, Issue 3, September 1982, Pages 563-577, Abstract
The patterns of coordinated eye-head movement in gaze shift are influenced by preconditions of the experimental protocol, such as the predictability and amplitude of the stimulus and the subject's endeavor to move as instructed, either naturally or as fast as possible. Gaze-shift movements fall into four distinct types with respect to eye-head latency, each one involving particular gaze-shift errors and head acceleration trajectories.