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Subitizing and counting depend on different attentional mechanisms: evidence from visual enumeration in afterimages.

Publication ,  Journal Article
Simon, TJ; Vaishnavi, S
Published in: Percept Psychophys
August 1996

Two experiments showed that, when selective eye movements were disabled by the presentation of stimuli in the form of afterimages, increased inspection time and facilitative stimulus configurations failed to increase the subitizing limit of 4 objects. Afterimages of two to eight dots induced by a photographic flashgun were shown to 3 adult subjects. For more than 4 objects, enumeration errors occurred at a rate of 20%-30%. Enumeration was effectively perfect for 2-4 linearly configured dots, with occasional errors surprisingly occurring in that range when dots appeared in groups of up to 3 items. No errors occurred in nonafterimage control conditions. Enumeration errors were attributed to failures of individuating dots to be counted due to the deactivation of selective eye movements in afterimages. A third experiment supported this interpretation by disabling eye movements with briefly presented stimuli and producing results much like those of the afterimage conditions.

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Published In

Percept Psychophys

DOI

ISSN

0031-5117

Publication Date

August 1996

Volume

58

Issue

6

Start / End Page

915 / 926

Location

United States

Related Subject Headings

  • Psychophysics
  • Pattern Recognition, Visual
  • Orientation
  • Male
  • Humans
  • Figural Aftereffect
  • Female
  • Eye Movements
  • Experimental Psychology
  • Double-Blind Method
 

Citation

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Simon, T. J., & Vaishnavi, S. (1996). Subitizing and counting depend on different attentional mechanisms: evidence from visual enumeration in afterimages. Percept Psychophys, 58(6), 915–926. https://doi.org/10.3758/bf03205493
Simon, T. J., and S. Vaishnavi. “Subitizing and counting depend on different attentional mechanisms: evidence from visual enumeration in afterimages.Percept Psychophys 58, no. 6 (August 1996): 915–26. https://doi.org/10.3758/bf03205493.
Simon, T. J., and S. Vaishnavi. “Subitizing and counting depend on different attentional mechanisms: evidence from visual enumeration in afterimages.Percept Psychophys, vol. 58, no. 6, Aug. 1996, pp. 915–26. Pubmed, doi:10.3758/bf03205493.

Published In

Percept Psychophys

DOI

ISSN

0031-5117

Publication Date

August 1996

Volume

58

Issue

6

Start / End Page

915 / 926

Location

United States

Related Subject Headings

  • Psychophysics
  • Pattern Recognition, Visual
  • Orientation
  • Male
  • Humans
  • Figural Aftereffect
  • Female
  • Eye Movements
  • Experimental Psychology
  • Double-Blind Method