Interhemispheric integration of letter stimuli presented foveally or extra-foveally

Michal Lavidor, Andrew W. Ellis

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Two experiments are reported in which participants decided whether a single target letter presented below and to the left or right of fixation matched either of two probe letters presented above the fixation cross to the left and right. The level of matching required was either physical (A-A) or abstract (A-a). All three letters were presented either extra-foveally (Experiment 1) or within the fovea (Experiment 2). In both experiments, physical matching was faster than abstract matching. Physical matching was faster within than across visual fields while abstract matching showed the opposite pattern. Matching was faster when the matching probe letter was in the LVF than when it was in the RVF. Importantly, the pattern of results was the same for extra-foveal and foveal presentations, supporting the theory that the representation of the fovea is split down the middle into two visual fields rather then being bilateral. The practical implication following this study is that lateralization studies can be performed with closer to fixation stimuli presentation.

Original languageEnglish
Pages (from-to)69-83
Number of pages15
JournalCortex
Volume39
Issue number1
DOIs
StatePublished - Feb 2003
Externally publishedYes

Bibliographical note

Funding Information:
Acknowledgements. This study was supported by the European commission, Marie Curie

Keywords

  • Abstract letter matching
  • Interhemispheric integration
  • Nasotemporal overlap
  • Split fovea
  • Visual word recognition

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