Bulletin of the Psychonomic Society

, Volume 29, Issue 5, pp 448–450

Perceived numerosity as a function of array number, speed of array development, and density of array items

  • Walter H. Hollingsworth
  • J. Paul Simmons
  • Tammy R. Coates
  • Henry A. Cross
Article

DOI: 10.3758/BF03333967

Cite this article as:
Hollingsworth, W.H., Simmons, J.P., Coates, T.R. et al. Bull. Psychon. Soc. (1991) 29: 448. doi:10.3758/BF03333967
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Abstract

College-student subjects engaged in judgments of numerosity received stimulus arrays on a computer screen that varied in their number level (low, medium, and high), the speed with which the array developed (slow, medium, or fast), and the density of the items in the array (low or high density). The subjects overestimated number when the array was small (75-125 items) but significantly underestimated number when it was at a medium (150-250) or high level (550-650). Density of array items was a significant variable, since subjects showed more underestimation under the high-density condition. Additionally, there was a speed × density interaction. The results are discussed with respect to which class of variable, sensory or cognitive, most influences perceived numerosity.

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Copyright information

© Psychonomic Society, Inc. 1991

Authors and Affiliations

  • Walter H. Hollingsworth
    • 1
  • J. Paul Simmons
    • 1
  • Tammy R. Coates
    • 1
  • Henry A. Cross
    • 1
  1. 1.Mobile CollegeMobile
  2. 2.Department of PsychologySt. Mary’s College of MarylandSt. Mary’s City