How the Range Effect Contaminates Control Scores in Studies of Visual Illusions

Author:

Hotopf W H Norman,Brown Susannah A1

Affiliation:

1. (Department of Statistics), London School of Economics and Political Science, Houghton Street, London WC2A 2AE, UK

Abstract

The relationship between mean control scores and mean experimental scores in 23 experiments on alignment illusions has been examined. Evidence is presented to show that, through the operation of the range effect, control scores are biased to a significant degree in the direction of experimental scores. The implications of this are considered, not only as regards the value of control scores in psychophysical studies, but also as further evidence of the dangers of within-subjects experimental designs when issues depend upon the values of extreme points in a range of values.

Publisher

SAGE Publications

Subject

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

Reference20 articles.

1. The Staircase-Method in Psychophysics

2. Reversal of the Müller-Lyer Illusion with Changes in the Length of the Inter-Fins Line

3. Hollingworth H L, 1909 “The inaccuracy of movement” Archives of Psychology the whole of 2, No.13

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