Many factors can influence, or bias, human decision making. A considerable amount of research has investigated the neural correlates of such biases, mostly correlating hemodynamic responses in brain areas with some aspect of the decision. These studies, typically done using functional magnetic resonance imaging or positron emission tomography, have provided useful information about the location of processing in the brain. However, comparatively little research has examined when these processes occur. The present experiment addressed this question by using magnetoencephalography (MEG) to record brain activity while subjects chose preferred options from decision sets. We found that MEG signal deviations for biased decisions occurred as early as 250-750 ms following stimulus onset. Such deviations occurred earliest in sensors over the right anterior cortex. These findings improve our understanding of temporal dynamics of decision biases and suggest ways that existing explanations for this bias could be refined.
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Acknowledgments We are indebted to Joseph Redden, Paul Johnson, Allan Chen, and Akshay Rao for their comments on an earlier draft of this manuscript. This research was supported by the University of Minnesota Center for Cognitive Sciences, the Department of Veterans Affairs, and the American Legion Brain Sciences Chair.
Copyright 2010 Elsevier B.V., All rights reserved.
- Decision neuroscience