Encoding uncertainty in the hippocampus
Neural Networks
Effective connectivity of the fronto-parietal network during attentional control
Journal of Cognitive Neuroscience
Hippocampal involvement in processing of indistinct visual motion stimuli
Journal of Cognitive Neuroscience
Journal of Cognitive Neuroscience
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Shannon's information theory provides a principled framework for the quantitative analysis of brain responses during the encoding and representation of event streams. In particular, entropy measures the expected uncertainty of events in a given context. This contextual uncertainty or unpredictability may, itself, be important for balancing [bottom-up] sensory information and [top-down] prior expectations during perceptual synthesis. Using event-related functional magnetic resonance imaging (fMRI), we found that the anterior hippocampus is sensitive to the entropy of a visual stimulus stream. In contrast, activity in an extensive bilateral cortico-thalamic network was dictated by the surprise or information associated with each particular stimulus. In short, we show that the probabilistic structure or context in which events occur is an important predictor of hippocampal activity.