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Biomedical subjects

M Jeannerod

Publications and source records attributed to M Jeannerod.

162 records · Page 9Linked to original sources
PubMedDate not supplied

Visual pathways for object-oriented action and object recognition: functional anatomy with PET.

The purpose of this study was to identify the functional anatomy of the mechanisms involved in visually guided prehension and in object recognition in humans. The cerebral blood flow of seven subjects was investigated by positron emission tomography. Three conditions were performed using the same set of stimuli. In the 'grasping' condition, subjects were instructed to accurately grasp the objects. In the 'matching' condition, subjects were requested to compare the shape of the presented object with that of the previous one. In the 'pointing' condition (control), subjects pointed towards the objects. The comparison between grasping and pointing showed a regional cerebral blood flow (rCBF) increase in the anterior part of the inferior parietal cortex and part of the posterior parietal cortex. The comparison between grasping and matching showed an rCBF increase in the cerebellum, the left frontal cortex around the central sulcus, the mesial frontal cortex and the left inferior parietal cortex. Finally, the comparison between matching and pointing showed an rCBF increase in the right temporal cortex and the right posterior parietal cortex. Thus object-oriented action and object recognition activate a common posterior parietal area, suggesting that some kind of within-object spatial analysis was processed by this area whatever the goal of the task.

Adult↗
PubMedDate not supplied

[Contribution of JM Charcot to the study of motor localizations in man].

The notion of a motor cortical area was introduced in neurology by the clinical work of H. Jackson and by the animal experiments of E. Hitzig and D. Ferrier between 1870 and 1874. As early as 1875, J.M. Charcot undertook a broad anatomoclinical study of about 200 cases selected on the basis of localization of lesions and motor symptomatology. Charcot and Pitres' publications on this subject were analyzed and their arguments for including the postcentral gyrus in motor areas were discussed.

History, 19th Century↗
PubMedDate not supplied

[Imagery and its neurological substrate].

What is the nature and the neural substrate of mental representation? This paper reviews findings from experimental psychology demonstrating that visual imagery and perception have similar characteristics. These results suggest that visual imagery and visual perception rely on the same neural substrate. Brain imaging studies as well as clinical observations of neurological patients support this hypothesis. Visual imagery involves visual cortical areas. However, selective visual impairments following damage to the cortical visual system may produce some dissociation between imagery and perception. Similar observations concerning motor imagery are now established in both normals and in neurological patients. Evidence that motor imagery and motor control share some modality specific neural representations are clearly supported by tomographic measurements of cerebral blood flow.

Animals↗