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Volume 16, Number 20, Issue of October 15, 1996 pp. 6504-6512
Copyright ©1996 Society for NeuroscienceFunctional Anatomy of Spatial Mental Imagery Generated from Verbal Instructions
Received April 5, 1996; revised July 18, 1996; accepted July 24, 1996.
Emmanuel Mellet1, Nathalie Tzourio1, Fabrice Crivello1, Marc Joliot1, Michel Denis2, and Bernard Mazoyer1 1 Groupe d'Imagerie Neurofonctionnelle, Commissariat à l'Energie Atomique-Département de Recherche Médicale and Délégation Gènèrale à la Recherche et Technologie EA 1555, Service Hospitalier Frédéric Joliot, 91401 Orsay Cedex, France, and 2 Groupe Cognition Humaine, Laboratoire d'Informatique et de Mécanique pour les Sciences de l'Ingénieur-Centre National de la Recherche Scientifique, 91400 Orsay, France
Positron emission tomography (PET) was used to monitor regional cerebral blood flow variations while subjects were constructing mental images of objects made of three-dimensional cube assemblies from auditorily presented instructions. This spatial mental imagery task was contrasted with both passive listening (LIST) of phonetically matched nonspatial word lists and a silent rest (REST) condition. All three tasks were performed in total darkness. Mental construction (CONS) specifically activated a bilateral occipitoparietal-frontal network, including the superior occipital cortex, the inferior parietal cortex, and the premotor cortex. The right inferior temporal cortex also was activated specifically during this condition, and no activation of the primary visual areas was observed. Bilateral superior and middle temporal cortex activations were common to CONS and LIST tasks when both were compared with the REST condition. These results provide evidence that the so-called dorsal route known to process visuospatial features can be recruited by auditory verbal stimuli. They also confirm previous reports indicating that some mental imagery tasks may not involve any significant participation of early visual areas.
Key words: spatial mental imagery; dorsal visual pathway; frontal cortex; parietal cortex; occipital cortex; precuneus; position emission tomography; cerebral blood flow
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