| Budget Amount *help |
¥2,900,000 (Direct Cost: ¥2,900,000)
Fiscal Year 2000: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1999: ¥2,400,000 (Direct Cost: ¥2,400,000)
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| Research Abstract |
This research has attempted to reveal the relationship between visual space perception and visually directed action from an ecological viewpoint. The problem of how we perceive the distance is very old. Most research has been concerned with describing how accurately we perceive the distance from objects to ourselves (i.e. egocentric distance), while a little research has been conducted on how we perceive the distance between objects (allocentric distance) located in a scene. In a broad, open field under full-cue conditions, it is well known that depth intervals on the ground plane are underestimated than frontal intervals, event with the physical equality. However, when observers were asked to view targets and then, with their eyes closed, attempt to walk directly their locations, performance was quite accurate (Loomis et al., 1992). In this research, similar results were obtained. In the perceptual matching task, however, when the frontal intervals, transformed into visual angle, were plotted against sagittal angle, linear relationships were found in both the depth and frontal presentation of stimuli, suggesting that, under full-cue conditions, both the egocentric and allocentric frames of reference were used for visual analysis of the scene. Of main interest are the response intervals between the two targets indicated by the blind walking. In the depth presentation condition, the indicated intervals were the same both in the depth and frontal directions. In the frontal presentation, however, the intervals in the depth direction were significantly overestimated than those in the frontal direction. These findings are discussed in terms of the efficiency of the egocentric frame of reference by which visual space perception and motor actions are constructed.
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