Sie sind hier: Startseite Unser Institut Abteilungen Entwicklungs- und Pädagogische Psychologie Mitarbeiterinnen und Mitarbeiter Priv.-Doz. Dr. Michael Kavšek The Impact of Stereoscopic Depth on the Munker-White Illusion

The Impact of Stereoscopic Depth on the Munker-White Illusion

Abstract

The current study investigated the impact of stereoscopic depth information on adults’ perception of a colored version of the Munker-White illusion. In one half of the illusory figure, red patches were embedded in black stripes and flanked by yellow stripes. In the other half of the illusory figure, red patches were embedded in yellow stripes and flanked by black stripes. The red patches either remained in the same depth plane as the black and yellow inducing stripes (zero horizontal disparity condition) or were shifted into the foreground (crossed horizontal disparity condition) or into the background (uncrossed horizontal disparity condition). According to the results, the illusory effect was robust across all viewing conditions. The illusion mainly consisted of a subjective darkening of the red patches superimposed on the yellow stripes, a perceived hue shift of the red patches superimposed on the black stripes toward yellow, and a subjective saturation decrease in both kinds of red patches. Moreover, the study established a partial confirmation of Anderson’s (e.g., 1997) scission theory, according to which the Munker-White illusion should be largest in the crossed horizontal disparity condition, intermediate in the zero horizontal disparity condition, and smallest in the uncrossed horizontal disparity.

Adult participants were presented with three computer animations. In each animation, the illusory figure was split into two parts, one in which red horizontal rectangular patches were superimposed on black horizontal stripes, and one in which red horizontal rectangular patches were superimposed on yellow horizontal stripes. One of the stimulus parts was situated on the left half of the computer screen and the other one was situated on the right half of the screen. The participants were tested under a crossed horizontal disparity condition, a zero horizontal disparity condition (with no depth), and an uncrossed horizontal disparity condition. In the crossed horizontal disparity condition, the red patches were shifted into the foreground (upper part). In the uncrossed horizontal disparity condition (lower part), the red patches were shifted into the background. In the zero horizontal disparity condition (middle part), the red patches were situated in the same depth plane as the flanking and embedding stripes. The stereoscopic impression can be generated by cross-fusing the left half and the right half of the stimuli. The participants’ task was to assess the perceived color of the red patches.
 

 

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