TITLE

CIRCUMSCRIBED SHAPES ARE ENLARGED: IS THIS A VARIATION OF THE DELBOEUF ILLUSION?

AUTHOR(S)
Jaeger, Ted
PUB. DATE
June 2007
SOURCE
Perceptual & Motor Skills;Jun2007 Part2, Vol. 104 Issue 3, p1116
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Pairs of complex shapes, for example, two golf holes or two hands making a peace sign, were printed on cards with one of the two shapes surrounded by a circle. 20 participants judged the size of the unenclosed shapes relative to the size of the enclosed ones. For 12 pairs in which there were physical differences in size of the two shapes, participants made veridical judgments. More importantly, for the six pairs in which the unenclosed and circumscribed shapes were the same size, the unenclosed shapes were judged smaller than the circumscribed ones. Thus, a novel illusion in which surrounding circles perceptually enlarge a variety of interior shapes is demonstrated.
ACCESSION #
26712665

 

Related Articles

  • arc.  // American Heritage Student Science Dictionary;2009, p20 

    A definition of the term "arc" is presented. It refers to a segment of a circle.

  • cir·cle.  // American Heritage Student Science Dictionary;2009, p70 

    A definition of the term "circle" is presented. It refers to a closed curve whose points are all on the same plane and at the same distance from a fixed point. A diagram of a circle is outlined.

  • cir·cum·fer·ence.  // American Heritage Student Science Dictionary;2009, p70 

    A definition of the term "circumference" is presented. It refers to the boundary line of a circle or the boundary line of a figure, area, or object. Circumference is the length of such a boundary.

  • semicircular.  // Taber's Cyclopedic Medical Dictionary;2005, p1969 

    A definition of the term "semicircular" is presented. It depicts the form of a half circle.

  • Circle Numbers for Star Discs. Richter, W.-D. // ISRN Geometry;2011, Special section p1 

    The notion of a generalized circle number which has recently been discussed for l2,p-circles and llipses will be extended here for star bodies and a class of unbounded star discs.

  • AREA, DIAGONALS, AND CIRCUMFERENCE OF A CYCLIC QUADRILATERAL. Ayoub, Ayoub B. // Mathematics & Computer Education;Winter2006, Vol. 40 Issue 1, p58 

    This article shows that the three quadrilaterals can be inscribed in the same circle. It also aims to calculate the lengths of their diagonals and the radius of their circumcircle. Area of a cyclic quadrilateral is considered in this article. It tackles reordering the sides of a cyclic...

  • cone.  // American Heritage Student Science Dictionary;2009, p79 

    A description of cone is given. A cone is known as a three-dimensional surface or solid object in which the base is a circle and the sides narrow to form a point. The surface of a cone is formed mathematically by moving a line that passes through a fixed point (the vertex) along a circle.

  • ansiform.  // Taber's Cyclopedic Medical Dictionary;2005, p128 

    A definition of the term "ansiform" is presented. Ansiform means shaped like a loop. The term originated from the words "ansa" and "forma" which means a handle and shape, respectively. The definition is from the "Taber's Cyclopedic Medical Dictionary," published by F. A. Davis Co. The...

  • OPTRICKS.  // Current Science;4/17/2009, Vol. 94 Issue 15, p16 

    A quiz related to optical illusions is presented.

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics