Visual illusion and line bisection: a bias hypothesis revisited

Experimental Brain Research
Sergio Chieffi

Abstract

It is generally accepted that visual illusions affect line bisection in the predicted direction. However, it has been reported an illusionary bias which seems questioning such general view. In a previous study, participants bisected lines flanked at both ends by two pairs of arrows, pointing in the same direction. The medialmost vertices of one pair converged on the line (converging arrows), whereas those of the other pair did not (non-converging arrows). Participants bisected lines toward the base of the arrows, i.e., toward the wider end of the stimulus and in the direction opposite to that predicted by the Baldwin illusion. However, the bisection bias was also directed away from the location of the converging arrows. We investigated what is the main factor affecting line bisection: arrows orientation, as previously suggested, or interference effects related to the location of converging arrows. In experiment 1, participants bisected lines flanked by converging versus non-converging arrows. Results confirmed the presence of a bisection bias directed not only toward the base of the converging arrows but also away from their location. In experiment 2, the arrows were located more internally, so that their medialmost vertices al...Continue Reading

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Aug 6, 2014·Experimental Brain Research·Sergio ChieffiMarcellino Monda

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Citations

Jun 8, 2017·Frontiers in Neurology·Sergio ChieffiMarcellino Monda
Jul 1, 2017·Frontiers in Psychology·Sergio ChieffiGiovanni Messina
Mar 7, 2017·Frontiers in Physiology·Sergio ChieffiMarcellino Monda
Nov 30, 2018·Frontiers in Psychology·Sergio ChieffiVincenzo Monda
Mar 3, 2017·Experimental Brain Research·Sergio ChieffiMarcellino Monda

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