Investigating letter recognition in the brain by varying typeface: An event-related potential study

Hannah Keage, Scott Coussens, Mark Kohler, Myra Thiessen, Owen Churches

    Research output: Contribution to journalArticle

    4 Citations (Scopus)

    Abstract

    We aimed to investigate the contributions of visual letter form and abstract letter identity to the time course of letter recognition, by manipulating the typeface (i.e. font) in which letters were presented. Twenty-six adult participants completed a modified one-back task, where letters where presented in easy-to-read typefaces ("fluent" letter stimuli) or difficult-to-read typefaces ("disfluent" letter stimuli). Task instructions necessitated that participant's focus on letter identity not visual letter form. Electroencephalography was collected and event-related potentials (ERPs) were calculated relative to letter stimuli. It was found that typeface affected both early-mid (N1 amplitude and P2-N2 amplitude and latency) and late processing (450-600. ms), thereby including time points whereby it is theorised that abstract identity is extracted from visual letter form (that is, 300. ms post-stimulus). Visual features of the letter therefore affect its processing well beyond the currently theorised point at which abstract information is extracted; which could be explained by a feedback loop between abstract letter representations and lower-level visual form processing units, which is not included in current cognitive reading models.

    Original languageEnglish
    Pages (from-to)83-89
    Number of pages7
    JournalBrain and Cognition
    Volume88
    Issue number1
    DOIs
    Publication statusPublished - 2014

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