Isolation of a central bottleneck of information processing with time-resolved FMRI |
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Authors: | Dux Paul E Ivanoff Jason Asplund Christopher L Marois René |
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Institution: | Department of Psychology, Vanderbilt Vision Research Center, Center for Integrative and Cognitive Neurosciences, Vanderbilt University, Nashville, Tennessee 37203, USA. |
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Abstract: | When humans attempt to perform two tasks at once, execution of the first task usually leads to postponement of the second one. This task delay is thought to result from a bottleneck occurring at a central, amodal stage of information processing that precludes two response selection or decision-making operations from being concurrently executed. Using time-resolved functional magnetic resonance imaging (fMRI), here we present a neural basis for such dual-task limitations, e.g. the inability of the posterior lateral prefrontal cortex, and possibly the superior medial frontal cortex, to process two decision-making operations at once. These results suggest that a neural network of frontal lobe areas acts as a central bottleneck of information processing that severely limits our ability to multitask. |
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