Neural Mechanisms of Global Reading
The neural mechanisms underlying global reading on tabular representations were investigated using the task-switching paradigm in event-related functional magnetic resonance imaging. Participants were required to make an appropriate response based on the latest task cue using stimuli tabulated in five rows and five columns with labels. The task was either local or global, and critical events included both cue and target events, which enabled separate analyses of the preparation and execution stages of each type of reading process. Neuroimaging results revealed differential activations between local and global tasks in both preparation and execution stages. For the preparation stage, global cues led to larger activation in the extrastriate cortex, which has been shown as the neural basis of selective attention in the literature. For the execution stage, the left middle temporal gyrus and inferior parietal lobule were more activated in the local task. These areas comprise an object-based attentional selection network, which serves to attend to a particular element in the table that changed with each event. For the global task, the left inferior frontal junction showed high activation, suggesting that the task demanded more cognitive control. The implications of these findings are discussed with respect to the characteristics of global reading.
Keywordsglobal reading fMRI cognitive control
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