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2 Acta Neurobiologiae Experimentalis

2 2005

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Distracting effects in length matching

100%

Bulatov A. , Bertulis A.

nr 3

265-269

In psychophysical experiments, subjects matched two spatial intervals of a three-spot stimulus into what appeared to them to be equal. The stimulus was flanked by stripes. The length matching errors increased in proportion to the referent interval of the stimulus and approached 6-12 percent of its length. Also, the error increased with an increase of the width of the gaps between the spots and the distracting stripes. Error reached a maximum at gaps equal to 10-15 percent of the length of the referent interval of the stimulus. When the luminance of the stripes increased or decreased, in comparison to the luminance of the background, length matching errors grew symmetrically and became approximately constant at higher contrasts. The experimental findings show the presence of local positional averaging which may be described quantitatively by means of spatial filtering procedures.

Superimposition of illusory patterns with contrast variations

100%

Bulatov A. , Bertulis A.

tom 65

nr 1

51-60

In psychophysical experiments, a perceived length matching task was performed. The stimuli were made of two spatially superimposed illusory figures that differed in structure and luminance contrast but had the same length and coincided precisely, with their ends matched. The contrast of one of the figures was fixed, and that of the other varied. In experiments with stimuli viewed monocularly, the combined patterns produced illusions of perceived length, the strength of which varied with alterations of contrast of one of the figures. If the figures were presented separately to different eyes of the same subject, changes of contrast did not have a noticeable influence on the illusion's strength. When the two stimulus components were displaced spatially and shown side by side, the monoptic and dichoptic stimuli yielded different results as well. The illusion's strength increased with an increase of the distance between the figures when viewed monocularly, but remained invariable if the figures were presented separately to each eye. The results obtained in experiments with dichoptic stimuli suggest that stimulus length distortions may occur in the monocular retinocortical pathways.