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Lightness Compression and Hue Changes

Published online by Cambridge University Press:  10 April 2014

Julio Lillo  and
Humberto Moreira
Julio Lillo*
Affiliation:
Universidad Complutense de Madrid
Humberto Moreira
Affiliation:
Universidad Complutense de Madrid
*
Correspondence should be addressed to Dr. Julio Lillo Jover. Departamento de Psicología Diferencial y del Trabajo. Facultad de Psicología. Universidad Complutense de Madrid. Campus de Somosaguas. 28223. Madrid (Spain). Tel: +34 91 3943198. Fax + 34 913942820. Email: [email protected]
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Abstract

Two experiments were performed to relate the Bezold-Brücke (B-B) and lightness compression effects. The first used a calibrated screen to present an achromatic luminance staircase. In addition, it reproduced, the methodology and the essential aspects the lightness compression effect discovered by Cataliotti and Gilchrist (1995). That is, observers perceived a truncated grey scale (from white to medium grey) when the staircase was the only stimulation in the near background (Gelb condition), but not when presented on a Mondrian background, because of the high articulation level provided by this background. Experiment 1 design also included two other backgrounds that produced a partial compression effect. In Experiment 2, two chromatic staircases were used. Employing a naming task, changes in hue perception were only observed for the susceptible staircase. The observed changes were of two types. First, for the full staircase presentations, a Gelb background produced maximum lightness compression (more similarity in the lightness of the staircase stimuli) and, also, a minimum B-B effect (fewer differences in hue). Second, only for the Gelb condition, there were changes in the hue of the lowest luminance staircase stimuli depending on the staircase extension. Results are discussed in the framework of the anchoring theory of lightness perception.

Se realizaron dos experimentos para relacionar el efecto Bezold-Brücke y el de compresión de la claridad. En el primero se utilizó un monitor calibrado para presentar una escalera acromática de luminancias. Aparte de ello, el experimento reprodujo la metodología y los aspectos esenciales del efecto de compresión de la claridad descubierto por Cataliotti y Gilchrist (1995). Esto es, los observadores percibieron una escala de grises truncada (del blanco al gris medio) cuando la escalera fue la única estimulación presentada en el entorno próximo (condición Gelb), pero no cuando se presentó sobre un Mondrian, debido al alto nivel de articulación proporcionado por este fondo. El diseño del primer experimento también incluyó otros dos fondos que produjeron un efecto de compresión parcial. En el segundo experimento se utilizaron dos escaleras cromáticas. Una tarea de denominación permitió apreciar cambios en la percepción del matiz sólo en la escalera susceptible. Los efectos observados fueron de dos tipos. Primero, cuando se presentó la escalera completa, se observó que el fondo Gelb produjo una máxima compresión de la claridad (máxima similitud entre los estímulos de la escalera) y, también, un grado mínimo de efectos B-B (menos diferencias en matiz). Segundo, sólo para la condición Gelb hubo cambios en el matiz del estímulo de menor luminancia de la escalera, dependiendo de la extensión de la escalera. Los resultados se comentan en el marco de referencia proporcionado por la teoría del anclaje de la percepción de la claridad.

Keywords

colorarticulationBezold-BrückelightnesscolorarticulaciónBezold-Brückeclaridad
Type
Monographic Section: Spatial Vision and Visual Space
Information
The Spanish Journal of Psychology , Volume 9 , Issue 2 , November 2006 , pp. 300 - 311
Copyright
Copyright © Cambridge University Press 2006

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