@article{oai:nagoya.repo.nii.ac.jp:00002241,
 author = {増井, 透 and MASUI, Tooru},
 journal = {名古屋大學教育學部紀要. 教育心理学科},
 month = {Dec},
 note = {When someone reached out his hand and pointed at something by his index finger, we would be able to identify the aimed object rather correctly regardless of the distance between the finger and the object. Such identification seems to be time-consuming process. lf we mentally extrapolate the finger (pointer) in the tridimensional space in order to select the object, it is possible to assume that there exists a certain kind of functional relation between the extrapolating time and the distance from pointer to object. In the first two experiments, the pointer and the target dot were presented on the screen, then the time the subjects took to judge whether or not the pointer pointed at the dot was recorded. The reaction times were found to increase linearly with increasing two dimensional distance between the pointer and the dot. Even when the pointer was presented after the target dot disappeared, they could almost exactly extrapolate the line to the target. The extrapolating time estimated was about 40ms/degree, which is rather faster than mental scanning rate estimated from the recent experiments requiring mental scanning between imaginary objects in the memorized scene. In the last experiment we attempted to investigate the extrapolation in the tridimensional space. The pointer was set up in front of the subject and he judged whether or not the pointer pointed at one of the objects positioned in the various tridimensional space. There were 8 objects in front of the pointer, and the pointer stopped with beep sound after random move, then the subject was required to press 'on' or 'off' key as fast as be could. Those procedure were same as in the first two experiments. In this case, the reaction times also increased linearly with the three-dimensional separation between the pointer and the target object. It was clear that the subjects extrapolated the pointer in the three dimensional space, not in the projected two-dimensional space. In the paradigm of mental scanning, as indicated by some researchers in the well known debates concerning mental imagery, scanning between objects was not necessarily in order to judge whether the target object was present in his imaginary scene. However in the present experiment, though he was not instructed to scan from the pointer to the object, and not necessarily select scanning strategy, he seemed to extrapolate the pointer spontaneously by himself. Those results suggested that we could extrapolate pointer straightly both in the two- and three-dimensional space, and to select specific spatial region correctly. However, the manipulated distance in those experiments were at most within 3 metres. Since three kinds of visual spaces have been suggested, i.e., manipulative space, orienting space, and background space, we must consider the latter two kinds of space in the next research., 国立情報学研究所で電子化したコンテンツを使用している。},
 pages = {113--122},
 title = {イメージ空間のメトリック},
 volume = {31},
 year = {1984}
}