Cortical magnification neutralizes the eccentricity effect in visual search

Marisa Carrasco, Karen S. Frieder

Research output: Contribution to journalArticlepeer-review


We report two visual search experiments that explain an eccentricity effect previously found: detection of both feature and conjunction targets becomes increasingly less efficient as the orientation target appears at more distant field eccentricities. By cortically magnifying the stimuli we flattened out this effect for both feature and conjunction tasks. We conclude that spatial resolution factors affect visual search findings that have hitherto been attributed to covert attention. We stress the importance of analyzing data by target position to minimize the confound of the set size effect and retinal/field eccentricity. An alternative theory of orientation asymmetries is offered.

Original languageEnglish (US)
Pages (from-to)63-82
Number of pages20
JournalVision research
Issue number1
StatePublished - Jan 1997


  • Cortical magnification
  • Retinal eccentricity
  • Spatial resolution
  • Visual search

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems


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