Effects of distance between standard and comparison lines on the Müller-Lyer illusion

The Müller-Lyer illusion was measured as a joint function of gap between fins and shaft and distance between standard and comparison lines. The results showed that the traditional function relating illusion to gap was present, but that the shape of the function was greatly influenced by the distance between standard and comparison lines. The mathematical formulation of assimilation theory provided adequate predictions under the assumption that the attentive field changes as a constant ratio of target size.

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