title: Localization of brief light stimuli on differently labelled reference patterns during smooth eye tracking.
abstract: Experiments are reported in which the mislocation of brief visual stimuli during tracking eye movements was measured in respect to three kinds of reference patterns placed in the horizontal plane--A) a scale with numbered divisions, B) a bar consisting of seven differently hatched regions; and C) two single markings, the distance between them being equal to the length of patterns A and B. A mislocation of a magnitude up to 2 degrees was obtained in all experiments. The mislocation on reference patterns A and C was the same, the presence of numbered markings did not influence it. The mislocation magnitude tended to decrease when reference pattern B was applied. Conclusion was made that clearly labelled structures near the place of stimulus presentation were a visual cue which affects localization; a scale with identical numbered markings, despite their proximity to the test stimulus, was not a structure of this type.
mesh_terms: D005133:Eye Movements; D006801:Humans; D010775:Photic Stimulation; D012684:Sensory Thresholds; D014785:Vision, Ocular