Letter matching in the hemispheres: Speed-accuracy trade-offs

Zohar Eviatar, Eran Zaidel

Research output: Contribution to journalArticlepeer-review


Eight subjects performed physical and nominal letter-matching tasks for pairs of letters presented in the left, right, or central visual fields, using a unimanual two-choice response-time paradigm. Latencies were manipulated by using a cued response procedure, and speed-sensitivity and speed-bias functions were calculated separately for each of the peripheral visual field by response hand conditions. Hemispheric contributions to these tasks were investigated by looking for evidence of exclusive specialization and callosal transfer. The results suggest that both hemispheres are able to perform the tasks and that they do so using similar processing strategies, but that they differ in the response-choice stage of the nominal identity task.

Original languageEnglish
Pages (from-to)699-710
Number of pages12
Issue number8
StatePublished - Aug 1992
Externally publishedYes

Bibliographical note

Funding Information:
oa~/edgrmmt.s-~reTsheea rch reported in this paper was supported by an APA Dissertation Award and a UCLA Graduate Division Research Award to Zohar Eviatar, and by NIH Grant NS20817 and NIMH RSA MH00179 to Eran Zaidel. We gratefully acknowledge the dedicated participation of Halle Brown, Jeff Clarke. Laura DaCosta. Todd Gross. Anne Maxwell, Brad Prickett, Brandall Suyenobu and Ava Yajima as subjects. We also thank Professor James P. Thomas for his advice and linancial support.

ASJC Scopus subject areas

  • Experimental and Cognitive Psychology
  • Cognitive Neuroscience
  • Behavioral Neuroscience


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