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Matching the orientation of dot patterns with real, interpolated, and extrapolated lines

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

The perception of the orientation of random-dot patterns was studied using four different matching tasks. Homogeneous, elongated patterns and patterns containing Moiré effects were used. One of the tasks implied linear extrapolation and two others implied linear interpolation of the matching line. The fourth task was identical with those used in previous studies by the authors on this topic. Systematic deviations from the axes of orientation of the patterns were observed for the latter task when compared with the former ones. When a short matching line, implying linear extrapolation, was used performance by subjects tended to be more inaccurate than in the other matching tasks. The linear interpolation tasks, in which the matching line was determined by either two collinear distant short lines or by two distant dots, provided more accurate and stable performance than the other two tasks. The results are discussed from the point of view of global orientation perception derived from an image function of the stimuli.

Affiliations: 1: Institute of Physiology, Czechoslovak Academy of Sciences 142 20 Prague 4-Krč, Czechoslovakia; 2: Institute of Physiology, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria; 3: Institute of Cybernetics, CNR, 80072 Arco Felice (NA), Italy


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