Tracking the mind's image in the brain I: time-resolved fMRI during visuospatial mental imagery |
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Authors: | Formisano Elia Linden David E J Di Salle Francesco Trojano Luigi Esposito Fabrizio Sack Alexander T Grossi Dario Zanella Friedhelm E Goebel Rainer |
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Institution: | Department of Cognitive Neuroscience, Faculty of Psychology, Universiteit Maastricht, Postbus 616, The Netherlands. |
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Abstract: | Mental imagery, the generation and manipulation of mental representations in the absence of sensory stimulation, is a core element of numerous cognitive processes. We investigate the cortical mechanisms underlying imagery and spatial analysis in the visual domain using event-related functional magnetic resonance imaging during the mental clock task. The time-resolved analysis of cortical activation from auditory perception to motor response reveals a sequential activation of the left and right posterior parietal cortex, suggesting that these regions perform distinct functions in this imagery task. This is confirmed by a trial-by-trial analysis of correlations between reaction time and onset, width, and amplitude of the hemodynamic response. These findings pose neurophysiological constraints on cognitive models of mental imagery. |
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