1. Hippocampus activation related to 'real-time' processing of visuospatial change
- Author
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Klaus L. Leenders, de Bauke Jong, Martijn Beudel, and Movement Disorder (MD)
- Subjects
0301 basic medicine ,Adult ,Male ,INFORMATION ,SPATIAL ATTENTION ,Motion Perception ,PREFRONTAL CORTEX ,Hippocampal formation ,PLACE CELLS ,Neuropsychological Tests ,Novelty detection ,Hippocampus ,03 medical and health sciences ,Judgment ,0302 clinical medicine ,WORKING-MEMORY ,Memory ,medicine ,Reaction Time ,Humans ,NETWORK ,Prefrontal cortex ,Molecular Biology ,COGNITIVE MAPS ,Spatial Memory ,Visuomotor control ,Brain Mapping ,Sensory gating ,Cognitive map ,Working memory ,Long-term memory ,General Neuroscience ,Novelty ,MEDIAL TEMPORAL-LOBE ,NOVELTY DETECTION ,Magnetic Resonance Imaging ,030104 developmental biology ,medicine.anatomical_structure ,LONG-TERM-MEMORY ,FMRI ,Space Perception ,Imagination ,Female ,Neurology (clinical) ,Psychology ,030217 neurology & neurosurgery ,Photic Stimulation ,Developmental Biology ,Cognitive psychology - Abstract
The delay associated with cerebral processing time implies a lack of real-time representation of changes in the observed environment. To bridge this gap for motor actions in a dynamical environment, the brain uses predictions of the most plausible future reality based on previously provided information. To optimise these predictions, adjustments to actual experiences are necessary. This requires a perceptual memory buffer. In our study we gained more insight how the brain treats (real-time) information by comparing cerebral activations related to judging past-, present- and future locations of a moving ball, respectively. Eighteen healthy subjects made these estimations while fMRI data was obtained. All three conditions evoked bilateral dorsal-parietal and premotor activations, while judgment of the location of the ball at the moment of judgment showed increased bilateral posterior hippocampus activation relative to making both future and past judgments at the one-second time-sale. Since the condition of such 'real-time' judgments implied undistracted observation of the ball's actual movements, the associated hippocampal activation is consistent with the concept that the hippocampus participates in a top-down exerted sensory gating mechanism. In this way, it may play a role in novelty (saliency) detection.
- Published
- 2016