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Spatial interval discrimination in the presence of flanking lines

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image of Spatial Vision
For more content, see Multisensory Research and Seeing and Perceiving.

Spatial interval discrimination was studied in the absence or presence of distractors. In the latter case, two flanking lines surrounded two vertical lines delimiting the spatial interval. Using a temporal 2AFC technique with a method of constant stimuli we measured the accuracy of performance (discrimination thresholds) and biases (points of subjective equality) depending on the separations between the target and the flanking lines. For separations less than or comparable to the size of the spatial interval we found both a reduction of precision and the increase of perceived sizes of the spatial intervals: the discrimination thresholds were increased, the size of the spatial interval was overestimated. For larger separations, the size of the spatial interval was underestimated, but the precision of performance was not affected by the presence of flanking lines. We discuss the possible mechanisms underlying spatial interval discrimination in the presence of flanking lines.

Affiliations: 1: I. P. Pavlov Institute of Physiology, Nab. Makarova 6, 199034 St Petersburg, Russia

10.1163/156856899X00148
/content/journals/10.1163/156856899x00148
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/content/journals/10.1163/156856899x00148
1999-01-01
2016-12-11

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