Impairment of grasping movements following a bilateral posterior parietal lesion

Jeannerod, Marc; Decety, Jean; François, Michel

doi:10.1016/0028-3932(94)90084-1

Cited by 397 publications

(165 citation statements)

References 22 publications

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“…Patients with posterior parietal lesions exhibit disturbances of spatial body knowledge (De Renzi, 1982), egocentric visually guided actions (Jeannerod, Decety, & Michel, 1994), and spatial attention (Heilman, Watson, & Valenstein, 1993). The superior parietal lobe is defined as the endpoint of the dorsal visual processing stream, which transforms visual information using an egocentric coordinate system (Milner & Goodale, 1995).…”

Section: Imagined Rotation and Spatial Processingmentioning

confidence: 99%

An fMRI study of imagined self-rotation

Creem

Downs

Wraga

et al. 2001

Cognitive, Affective, & Behavioral Neuroscience

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In the present study, functional magnetic resonance imaging was used to examine the neural mechanisms involved in the imagined spatial transformation of one's body. The task required subjects to update the position of one of four external objects from memory after they had performed an imagined self-rotation to a new position. Activation in the rotation condition was compared with that in a control condition in which subjects located the positions of objects without imagining a change in selfposition. The results indicated similar networks of activation to other egocentric transformation tasks involving decisions about body parts. The most significant area of activation was in the left posterior parietal cortex. Other regions of activation common among several of the subjects were secondary visual, premotor, and frontal lobe regions. These results are discussed relative to motor and visual imagery processes as well as to the distinctions between the present task and other imagined egocentric transformation tasks.

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Section: Imagined Rotation and Spatial Processingmentioning

confidence: 99%

An fMRI study of imagined self-rotation

Creem

Downs

Wraga

et al. 2001

Cognitive, Affective, & Behavioral Neuroscience

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“…On the other hand, patients with dorsal damage centred on the angular and supramarginal gyri of the posterior parietal cortex demonstrate severe visuomotor deficits, dissociated from their preserved ability to recognise objects and perceive their shape and size etc. (Milner et al, 2001, Jeannerod et al, 1994Perenin and Vighetto, 1988).…”

Section: Introductionmentioning

confidence: 99%

TMS can reveal contrasting functions of the dorsal and ventral visual processing streams

Ellison

Cowey

2006

Exp Brain Res

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. (2006) 'TMS can reveal contrasting functions of the dorsal and ventral visual processing streams.', Experimental brain research., 175 (4). pp. 618-625. Further information on publisher's website:https://doi.org/10.1007/s00221-006-0582-8Publisher's copyright statement:The original publication is available at www.springerlink.com Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Abstract:In order to investigate the functional specificity of the dorsal and ventral visual processing steams we used transcranial magnetic stimulation (TMS) to briefly disrupt one or the other while subjects performed three tasks, involving discrimination of colour or shape or relative position. TMS was delivered over right posterior parietal cortex (PPC) or right lateral occipital (LO) cortex, regions known to have visuospatial and object processing properties respectively. LO but not PPC stimulation had a significant effect on reaction time when subjects were asked to make a discrimination of relative shape. PPC stimulation had a significant effect when subjects were asked to discriminate relative position of the same shapes. Stimulation of LO also lengthened reaction times on the position task. There were no effects of stimulation at either site on colour discrimination. Results are discussed within the framework of how the dorsal stream and ventral stream are dissociated following their damage in neurological patients and possible ways in which they may interact in the normal brain.

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“…Electrophysiological (Andersen et al, 1987;Lacquaniti et al, 1995;MacKay and Mendonca, 1995;Sakata et al, 1985) and lesion studies (Crowne et al, 1992;Petrides and Iversen, 1979;Pu et al, 1993) in the monkey have established a role for posterior parietal cortex in coordinated visuomotor behavior such as reaching and grasping and parietal damage in humans can lead to visuomotor impairments such as an inability to use visual information in the guidance of eye or hand movements (Jeannerod et al, 1994) and failure to perform reaching movements on the basis of mirror reversed cues (Ramachandran et al, 1997). Neuroimaging studies have made it possible to fractionate different parts of the parietal cortex, according to their function and mental rotation (Alivisatos and Petrides, 1997), and mirror-reading tasks (Dong et al, 2000;Goebel et al, 1998;Kassubek et al, 2001;Poldrack et al, 1998;Poldrack and Gabrieli, 2001) have pinpointed a specific role for the superior parietal cortex in mediating visuospatial sensorimotor transformations (Dong et al, 2000;Goebel et al, 1998;Kassubek et al, 2001;Poldrack et al, 1998;Poldrack and Gabrieli, 2001).…”

Section: Introductionmentioning

confidence: 99%

Brain changes after learning to read and play music

et al. 2003

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Musically naive participants were scanned before and after a period of 15 weeks during which they were taught to read music and play the keyboard. When participants played melodies from musical notation after training, activation was seen in a cluster of voxels within the bilateral superior parietal cortex. A subset of these voxels were activated in a second experiment in which musical notation was present, but irrelevant for task performance. These activations suggest that music reading involves the automatic sensorimotor translation of a spatial code (written music) into a series of motor responses (keypresses).

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Impairment of grasping movements following a bilateral posterior parietal lesion

Cited by 397 publications

References 22 publications

An fMRI study of imagined self-rotation

An fMRI study of imagined self-rotation

TMS can reveal contrasting functions of the dorsal and ventral visual processing streams

Brain changes after learning to read and play music

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