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Cerebral Cortex, Vol. 10, No. 5, 473-481, May 2000
© 2000 Oxford University Press

Matching Two Imagined Clocks: the Functional Anatomy of Spatial Analysis in the Absence of Visual Stimulation

Luigi Trojano, Dario Grossi1, David E.J. Linden2,3, Elia Formisano4,5, Hans Hacker5, Friedhelm E. Zanella5, Rainer Goebel2 and Francesco Di Salle5,6

Salvatore Maugeri Foundation, IRCCS, Center of Telese, Loc. S. Stefano in Lanterria, I-82037 Telese Terme (BN), , 1 Departments of Neurological Sciences, , 4 Electronic Engineering and , 6 Radiological Sciences, Federico II University, Nuovo Policlinico, Via S. Pansini 5, I-80131 Naples, Italy, , 2 Max-Planck-Institut für Hirnforschung, Deutschordenstrasse 46, D-60528 Frankfurt am Main and , 3 Departments of Neurology and , 5 Neuroradiology, Klinikum der Johann Wolfgang Goethe-Universität, Schleusenweg 2–16, D-60528 Frankfurt am Main, Germany

Do spatial operations on mental images and those on visually presented material share the same neural substrate? We used the high spatial resolution of functional magnetic resonance imaging to determine whether areas in the parietal lobe that have been implicated in the spatial transformation of visual percepts are also activated during the generation and spatial analysis of imagined objects. Using a behaviourally controlled mental imagery paradigm, which did not involve any visual stimulation, we found robust activation in posterior parietal cortex in both hemispheres. We could thus identify the subset of spatial analysis-related activity that is involved in spatial operations on mental images in the absence of external visual input. This result clarifies the nature of top-down processes in the dorsal stream of the human cerebral cortex and provides evidence for a specific convergence of the pathways of imagery and visual perception within the parietal lobes.


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