Early Activity in Broca's Area During Reading Reflects Fast Access to Articulatory Codes From Print

Michael Klein, Jonathan Grainger, Katherine Wheat, Rebecca Millman, Michael Simpson, Peter Hansen, Piers Cornelissen

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)
7 Downloads (Pure)

Abstract

Prior evidence for early activity in Broca's area during reading may reflect fast access to articulatory codes in left inferior frontal gyrus pars opercularis (LIFGpo). We put this hypothesis to test using a benchmark for articulatory involvement in reading known as the masked onset priming effect (MOPE). In masked onset priming, briefly presented pronounceable strings of letters that share an initial phoneme with subsequently presented target words (e.g., gilp-GAME) facilitate word naming responses compared with unrelated primes (dilp-GAME). Crucially, these priming effects only occur when the task requires articulation (naming), and not when it requires lexical decisions. A standard explanation of masked onset priming is that it reflects fast computation of articulatory output codes from letter representations. We therefore predicted 1) that activity in left IFG pars opercularis would be modulated by masked onset priming, 2) that priming-related modulation in LIFGpo would immediately follow activity in occipital cortex, and 3) that this modulation would be greater for naming than for lexical decision. These predictions were confirmed in a magnetoencephalography (MEG) priming study. MOPEs emerged in left IFG at ∼100 ms posttarget onset, and the priming effects were more sustained when the task involved articulation.
Original languageEnglish
Pages (from-to)1715-1723
JournalCerebral Cortex
Volume25
Issue number7
Early online date20 Jan 2014
DOIs
Publication statusPublished - 1 Jul 2015

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