Open AccessMisconvergence to the stimulus plane causes apparent displacement of the stimulus elements seen monocularly 1
Author(s) -
NAKAMIZO SACHIO,
KAWABATA HIDEAKI,
ONO HIROSHI
Publication year - 2008
Publication title -
japanese psychological research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.392
H-Index - 30
eISSN - 1468-5884
pISSN - 0021-5368
DOI - 10.1111/j.1468-5884.2007.00361.x
Subject(s) - monocular , stimulus (psychology) , physics , fixation (population genetics) , median plane , optics , geometry , psychology , mathematics , chemistry , cognitive psychology , biochemistry , gene
When one binocularly views a group of vertical lines through a ring, the outermost line segments (one on each side) seen within the ring are seen monocularly while the segments of the same lines outside the ring are seen binocularly. The monocular segments appear to be displaced outward with respect to the center of the ring and with respect to the corresponding binocular segments outside the ring. Three experiments examined the extent and direction of this illusory displacement as a function of viewing distance, fixation disparity created by varying the angles of the two arms of a haploscope, and fixation disparity created by a stereoscope and different Nonius stimuli. The results of the experiments confirmed the hypothesis that the apparent displacement is due to misconvergence in accordance with Wells‐Hering's laws of visual direction.