The effects of reducing the range of spatial perception on the accuracy of visually guided locomotion were studied in two experiments. Limiting the range of perception to only near objects produces changes in the flow of stimulus detail and reduces opportunities for the appearance of an aiming point and for motion parallax. Such conditions were found to produce inferior performance compared to full vision, or to minimal background information. A defined aiming point was also found to assist control when no other background was present. The results are discussed with reference to theories of locomotor control and the design of artificial spatial sensing aids for the blind.
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References
1.
Bach-Y-RitaPCollinsC CSaundersFWhiteBScaddenL, 1969“Vision substitution by tactile image projection”Nature (London)221963–964.
2.
BarlowH BHillR M, 1963“Selective sensitivity to direction of movement in ganglion cells of the rabbit retina”Science139412–414.
3.
BrabynJ A, 1978Laboratory Studies of Aided Blind MobilityPhD thesis, University of Canterbury, New Zealand.
4.
BrabynJ AStrelowE R, 1977“Computer-analyzed measure characteristics of human locomotion and mobility”Behavior Research Methods and Instrumentation9456–462.
5.
DuftonR, 1966Proceedings of the International Conference on Sensory Devices for the Blind (London: St Dunstans).
6.
FoulkeE, 1971“The perceptual basis for mobility”American Foundation for the Blind Research Bulletin231–8.
7.
GibsonJ J, 1958“Visually controlled locomotion and visual orientation in animals”British Journal of Psychology49182–194.
8.
GibsonJ JOlumPRosenblattF, 1955“Parallax and perspective during aircraft landings”American Journal of Psychology68372–385.
9.
GordonD A, 1965“Static and dynamic fields in human space perception”Journal of the Optical Society of America551296–1303.
10.
JohanssonG, 1973“Monocular movement parallax and near-space perception”Perception2135–146.
11.
JohnstonI RWhiteG RCummingR W, 1973“The role of optical expansion patterns in locomotion control”American Journal of Psychology86311–324.
12.
KayL, 1966“Enhanced environmental sensing by ultrasonic waves” in Les Systems Sonars Animaux, Biologie et Bionique Ed. BusnelR G, (Jouy-en-Josas: Laboratoire de Physiologie Acoustique).
13.
KayL, 1974a“A sonar aid to enhance spatial perception of the blind: Engineering and evaluation”The Radio and Electronic Engineer44605–626.
14.
KayL, 1974bToward Objective Mobility Evaluation: Some Thoughts on a Theory (New York: American Foundation for the Blind).
15.
LeeD N, 1974“Visual information during locomotion” in Essays in Honour of J J Gibson Eds MacleodR BPickH L, (Ithaca, NY: Cornell University Press).
16.
LlewellynK R, 1971“Visual guidance of locomotion”Journal of Experimental Psychology91245–261.
17.
NakayamaKLoomisJ M, 1974“Optical velocity patterns, velocity-sensitive neurons, and space perception: A hypothesis”Perception363–80.
18.
NyeP WBlissJ C, 1970“Sensory aids for the blind: A challenging problem with lessons for the future”Proceedings of the IEEE581878–1898.
19.
ReganDBeverleyK I, 1979“Visually guided locomotion: Psychophysical evidence for a neural mechanism sensitive to flow patterns”Science205311–313.
20.
StrelowE RBrabynJ AClarkG R S, 1976“Apparatus for measuring and recording path, velocity and direction characteristics of human locomotion”Behavior Research Methods and Instrumentation8442–446.
21.
StrelowE RBoysJ T, 1979“Canterbury child's aid: A binaural spatial sensor for research with blind children”Journal of Visual Impairment and Blindness73179–184.
22.
WarrenR, 1976“The perception of egomotion”Journal of Experimental Psychology: Human Perception and Performance2448–456.
