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Central versus lateral presentation in hemispheric sentence processing: a paradoxical finding.

Jeffrey Coney¹, Kerry Judge

¹Murdoch University, Western Australia, Australia. J.Coney@murdoch.edu.au

Neuropsychologia

|August 8, 2006

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The right hemisphere may play a role in sentence comprehension, but direct evidence is limited. This study used cross-modal lexical priming to investigate hemispheric language processing, revealing surprising patterns of activation.

Area of Science:

Neuroscience
Psycholinguistics
Cognitive Science

Background:

The right cerebral hemisphere's role in complex language processing remains debated.
Distinguishing lexical from message-level activation is challenging in hemispheric studies.

Purpose of the Study:

To investigate hemispheric contributions to sentence comprehension using cross-modal lexical priming.
To differentiate direct lexical activation from syntactic reactivation by anaphora.

Main Methods:

Auditory sentence presentation with simultaneous visual word probes.
Cross-modal lexical priming (CMLP) procedure.
Presentation of visual probes to left visual field (LVF), right visual field (RVF), and central visual field.

Related Experiment Videos

Main Results:

LVF probes showed activation immediately after the target word.
RVF probes exhibited activation three words downstream.
Central probes showed activation at all sampling points, particularly with anaphora, while lateral probes did not.

Conclusions:

Hemispheric processing of language, especially complex structures, may require collaborative processing.
Simultaneous bilateral stimulation might be crucial for high-level integrative mechanisms in language comprehension.