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  • Title: The effects of varying fins in Müller-Lyer and Holding illusions.
    Author: Pressey A, Martin NS.
    Journal: Psychol Res; 1990; 52(1):46-53. PubMed ID: 2377725.
    Abstract:
    Five experiments were conducted to determine how distortion of spatial position induced by unidirectional Müller-Lyer fins varied as a function of angle and length of fins. Research employing Cornsweet's staircase method yielded ambiguous results, but psychophysical methods of magnitude estimation, paired comparisons, and production showed conclusively that distortions of position are affected by angle and length of fins in a manner similar to that found in distortions of length. It was concluded that similar strategies are employed in processing attributes of length and position and that a theory based on averaging of attributes within an attentional field describes the performance of real observers.
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