Investigation of visual space using an exocentric pointing task
نویسندگان
چکیده
منابع مشابه
Investigation of visual space using an exocentric pointing task.
Classically, it has been assumed that visual space can be represented by a metric. This means that the distance between points and the angle between lines can be uniquely defined. However, this assumption has never been tested. Also, measurements outdoors, where monocular cues are abundant, conflict with this model. This paper reports on two experiments in which the structure of visual space wa...
متن کاملExocentric pointing in three-dimensional space.
A study is reported of an exocentric pointing task in all three dimensions, in near space, with only two visible luminous objects--a pointer and a target. The task of the subject was to aim a pointer at a target. The results clearly show that visual space is not isotropic, since every set direction appeared to consist of two independent components--one in the projection onto a frontoparallel pl...
متن کاملExocentric pointing in the visual field
"Exocentric pointing in the visual field" involves the setting of a pointer so as to visually point to a target, where both pointer and target are objects in the visual field. Phenomenologically, such pointings show systematic deviations from veridicality of several degrees. The errors are very small in the vertical and horizontal directions, but appreciable in oblique directions. The magnitude...
متن کاملExocentric pointing in depth
An exocentric pointing task was used to compare the indicated pointing directions under exchange of target and pointer. Such a pair of pointing directions, together with the pointer and target locations, specifies a unique cubic arc. Such an arc may assume one of two qualitatively different shapes, namely a "C-arc" (constant sign of curvature) or an "S-arc" (containing a point of inflection bet...
متن کاملExocentric pointing to opposite targets.
We use an exocentric pointing task to study exocentric visual directions to targets that are opposite to a pointer relative to the observer. (The apparent distance between the target and the pointer always exceeded 90 degrees of visual angle.) All pointing takes place in the horizontal plane at eye height. Observers could not see both target and pointer at a single glance. They had to look back...
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ژورنال
عنوان ژورنال: Perception & Psychophysics
سال: 2000
ISSN: 0031-5117,1532-5962
DOI: 10.3758/bf03212156