HUMAN EYE-MOVEMENTS DURING VISUALLY GUIDED STEPPING

被引:113
作者
HOLLANDS, MA
MARPLEHORVAT, DE
HENKES, S
ROWAN, AK
机构
[1] University of Bristol, Bristol
基金
英国惠康基金;
关键词
EYE MOVEMENTS; LOCOMOTION; VISUOMOTOR;
D O I
10.1080/00222895.1995.9941707
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
Visually guided locomotion was studied in an experiment in which human subjects (N = 8) had to accurately negotiate a series of irregularly spaced stepping-stones while infrared reflectometry and electrooculography were used to continuously record their eye movements. On average, 68% of saccades made toward the next target of footfall had been completed (visual target capture had occurred) while the foot to be positioned was still on the ground; the remainder were completed in the first 300 ms of the swing phase. The subjects' gaze remained fixed on a target, on average, until 51 ms after making contact with it, with little variation. A greater amount of variation was seen in the timing of trailing footlift relative to visual target capture. Assuming that subjects sampled the visual cues as and when they were required, visual information appeared most useful when the foot to be positioned was still on the ground.
引用
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页码:155 / 163
页数:9
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