The Perceptual Salience of Symmetrical and Asymmetrical Sections of a Line

Author:

Stucchi Natale,Graci Valentina1,Toneatto Carlo,Scocchia Lisa2

Affiliation:

1. Bradford School of Optometry and Vision Science, University of Bradford, Bradford, UK

2. Frankfurt Institute for Advanced Studies, Frankfurt am Main, Germany

Abstract

A vertical line segment intersecting a horizontal one at different crossing points generates line sections. Visual perception of such line sections was investigated here in two experiments. In both experiments participants were most accurate and precise when they had to reproduce symmetrical sections. Interestingly, the different asymmetrical sections of a line were not equivalent in terms of participants' performance: constant errors changed as a function of sections and the error curve was nicely interpolated by the composition of two harmonics of the line length. In consistence with the harmonic fitting of the data, we propose that the perceptual salience of specific asymmetrical sections is a byproduct of the automatic triggering of a line midpoint identification process. Being perceptually tuned to symmetry warps our visual representation of the line, which results in systematic misperceptions. The way of bringing present and past experimental findings into a unitary whole is proposed.

Publisher

SAGE Publications

Subject

Artificial Intelligence,Sensory Systems,Experimental and Cognitive Psychology,Ophthalmology

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