Abstract
During a lexical decision task, lexical decision making can be distinguished from lexical retrieval. Lexical decision making is independent of stimulus modality and not reflected in the decision times, whereas the opposite holds for lexical retrieval. In neuroimaging studies investigating lexical decision tasks with either visual or auditory stimuli these two processes have so far been confused. Therefore, it is not clear whether the activation of Broca’s region, consisting of the left Brodmann’s area (BA) 44 and BA 45, reported in such studies really reflects lexical decision making. The present event-related fMRI study investigated the role of Broca’s region in lexical decision by analyzing brain activation that is independent of stimulus modality or decision times. Twenty-two healthy participants performed lexical decisions on visual and auditory real words and pseudo-words. The left BA 44 was conjointly activated during visual and auditory lexical decisions as compared to rest indicating the modality-independent involvement of BA 44 in lexical decision tasks in general. To identify brain activation related to lexical decision making rather than lexical retrieval the decision times were entered as covariates into the fMRI analysis. In this analysis, the left BA 44 was activated for visual and for auditory lexical decision making. These results indicate that the left BA 44 as a distinct sub-part of Broca’s region plays an important role in lexical decision making independently of stimulus modality and decision times.
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Acknowledgments
This Human Brain Project/Neuroinformatics research is funded by the National Institute of Biomedical Imaging and Bioengineering, the National Institute of Neurological Disorders and Stroke, and the National Institute of Mental Health (KA). Further support by Helmholtz-Gemeinschaft (VH-N6-012 to KA) and the Brain Imaging Center West (BMBF 01GO0204) is gratefully acknowledged. We thank Barbara Elghahwagi, Gabi Oefler, and Sharam Mirzazade for their assistance with fMRI data recording. We are grateful for inspiring discussions of the data with Jean-François Démonet, Daniela Perani, Walter Huber, Andreas Kleinschmidt, and Karsten Specht. Finally, we wish to acknowledge the helpful comments of two anonymous reviewers.
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Heim, S., Eickhoff, S.B., Ischebeck, A.K. et al. Modality-independent involvement of the left BA 44 during lexical decision making. Brain Struct Funct 212, 95–106 (2007). https://doi.org/10.1007/s00429-007-0140-6
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DOI: https://doi.org/10.1007/s00429-007-0140-6