AbstractReferences1. Craik K. J. W. , & Zangwill O. L. Observations relating to the threshold of a small figure within the contour of a closed-line figure. Brit. J. Psychol., 1939, 30, 139–150.2. Youniss J. , & Calvin A. D. The enclosing contour effect. Percept. Mot. Skills, 1961, 13, 75–81.
