Comparison of Head and Eye Tracting with and Without a Visual Cue to Head Position

摘要

Little is known about the ability of humans to pursue pseudo-random targets with the head. This has important implications in the design of head- steered machinery. The purpose of this study was to determine the effect of a visual cue to head position on gaze and head pursuit. Eleven subjects (3 females, 8 males) were studied as they tracked a pseudo-random horizontal one- dimensional laser target. The target consisted of the sum of six sinusoids. The frequency of the sinusoids was varied from 0.24 and 1.25 Hertz and each sinusoid had a randomly selected amplitude between 0.5 and 12 degrees. Three trials were run on each subject. For the first trial (Condition 1), each subject was instructed to follow the pseudo-random target using any combination of eye and head movement. In the next two trials, subjects were told to either track the target with the head (Condition HT) or to maintain a head-fixed laser on the target (Condition HR). The order of trial two and trial three was randomized.