Effects of number, complexity, and familiarity of flankers on crowded letter identification

Myriam Chanceaux, Sebastiaan Mathot, Jonathan Grainger*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

18 Citations (Scopus)
86 Downloads (Pure)

Abstract

We tested identification of target letters surrounded by a varying number (2, 4, 6) of horizontally aligned flanking elements. Strings were presented left or right of a central fixation dot, and targets were always at the center of the string. Flankers could be other letters, digits, symbols, simple shapes, or false fonts, and thus varied both in terms of visual complexity and familiarity. Two-alternative forced choice (2AFC) speed and accuracy was measured for choosing the target letter versus an alternative letter that was not present in the string. Letter identification became harder as the number of flankers increased. Greater flanker complexity led to more interference in target identification, whereas more complex targets were easier to identify. Effects of flanker complexity were found to depend on visual field and position of flankers, with the strongest effects seen for leftward flankers in the left visual field. Visual complexity predicted flanker interference better than familiarity, and better than target-flanker similarity. These results provide further support for an excessive feature-integration account of the interfering effects of both adjacent and nonadjacent flanking elements in horizontally aligned strings.

Original languageEnglish
Article number7
Number of pages17
JournalJOURNAL OF VISION
Volume14
Issue number6
DOIs
Publication statusPublished - Nov-2014
Externally publishedYes

Keywords

  • letter-in-string identification
  • crowding
  • flanker complexity
  • flanker type
  • LATERAL MASKING
  • OBJECT RECOGNITION
  • PERIPHERAL-VISION
  • VISUAL INTERFERENCE
  • LETTER PERCEPTION
  • ATTENTION
  • THRESHOLDS
  • CHARACTERS
  • SIMILARITY
  • ACCOUNT

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