Response Confidence and the Ponzo Illusion

• Published in: Perceptual and motor skills Vol. 74; no. 1; pp. 265 - 266
• Main Authors: Diaz, Luis F., Delay, Eugene R.
• Format: Journal Article
• Language: English
• Published: Los Angeles, CA SAGE Publications 01-02-1992; Perceptual and Motor Skills; Perceptual and Motor Skills, etc
• Subjects: Adolescent; Adult; Attention; Biological and medical sciences; Depth Perception; Female; Fundamental and applied biological sciences. Psychology; Humans; Male; Optical Illusions; Orientation; Pattern Recognition, Visual; Perception; Psychology. Psychoanalysis. Psychiatry; Psychology. Psychophysiology; Size Perception; Vision; Human; Confidence; Perceptual illusion; Vision; Optical illusion; Spatial orientation; Perception; Subjective evaluation
• ISSN: 0031-5125; 1558-688X
• DOI: 10.2466/pms.1992.74.1.265

The number of longer line judgements and the ratings of confidence in these judgements were significantly higher when the comparison line was located near the apex of the Ponzo wedge but only confidence ratings were affected by the orientation of the wedge (ns = 24 men, 24 women). Differences between the two measures suggest that perceptual and nonperceptual processes may be involved in the illusion.