The scale bandwidth of visual search

Preeti Verghese, Denis G. Pelli

Research output: Contribution to journalArticlepeer-review


Observers were asked to locate a target in a brief, two-scale display. Accuracy of locating the target was measured as a function of the ratio between the two scales. At each scale ratio, the probability of locating the target as a function of the number of elements is well fit by the idea that the observer accurately monitors only a "critical" number of elements. The dependence of critical number on scale ratio is well accounted for by a model that assumes that the observer's decision is based on an evenly spaced array of samples. The sample spacing is under attentional control, but is always uniform.

Original languageEnglish (US)
Pages (from-to)955-962
Number of pages8
JournalVision research
Issue number7
StatePublished - Apr 1994


  • Attention
  • Localization
  • Locating
  • Scale specificity Spatial scale Critical number
  • Spatial bandwidth of attention
  • Spatial frequency channels

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems


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