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The Oxford Compendium of Visual Illusions$
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Arthur G. Shapiro and Dejan Todorovic

Print publication date: 2017

Print ISBN-13: 9780199794607

Published to Oxford Scholarship Online: June 2017

DOI: 10.1093/acprof:oso/9780199794607.001.0001

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The Illusions of Numerosity

The Illusions of Numerosity

(p.696) Chapter 101 The Illusions of Numerosity
The Oxford Compendium of Visual Illusions

Riccardo Luccio

Oxford University Press

The illusions of numerosity can be broadly divided into two main categories (a) illusions of numerosity that can be observed in many classical illusions of linear or area extent just replacing the uninterrupted lines by rows of dots, or putting the elements to judge in the area, and (b) illusions in which the participants are clearly aware that the numbers of the elements to estimate are equal in two patterns, but despite this fact they judge that the elements in one pattern are “more” than in the other. Using a constant stimuli method both length/area and numerosity illusions move in the same direction, whereas using a magnitude estimation method the illusions disappear or move in opposite direction. All of this suggests the existence of at least two different cognitive mechanisms at the basis of this phenomenon.

Keywords:   illusions of numerosity, illusions, estimation method, constant stimuli method, magnitude estimation, cognitive mechanism

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