WOBIB: 182 - Lacquaniti, et al. (1997) Visuomotor Transf ...
 
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F. Lacquaniti; Daniela Perani; E. Guigon; V. Bettinardi; M. Carrozzo; F. Grassi; Yves Rossetti; F. Fazio. Visuomotor Transformations for Reaching to Memorized Targets: A PET study. NeuroImage 5(2):129-146, 1997. PMID: 9345543. DOI: 10.1006.nimg.1996.0254. FMRIDCID: . WOBIB: 182.

Positron emission tomography (PET) was used to identify cortical and subcortical regions involved in the control of reaching to visual targets. Regional cerebral blood flow (rCBF) was measured in eight healthy subjects using H215O PET during the performance of three different tasks. All tasks required central fixation while a 400-ms target was flashed every 5 s at a random location around a virtual circle centered on the fixation target. Additional instructions differed according to the task: (i)visual detectionof the target without overt responses; (ii)immediate pointingto the most recent target in the sequence, and (iii)pointing to the previoustarget in the sequence. By design, the two motor tasks differed in the cognitive processing required. In each trial ofimmediate pointing,the spatial location of only the most recent target needed to be processed. In each trial ofpointing to the previous,instead, while the most recent target was stored in memory for the movement of the next trial, the previous target had to be retrieved from memory to direct the current movement. Limb trajectories were comparable between the two motor tasks in terms of most spatiotemporal parameters examined. Significant rCBF increases were identified using analysis of covariance andtstatistics. Compared withvisual detectionthere was activation of primary sensorimotor cortex, ventrolateral precentral gyrus, inferior frontal gyrus in the opercular region, supramarginal gyrus, and middle occipital gyrus, all these sites in the hemisphere (left) contralateral to the moving limb, and cerebellar vermis, during bothimmediate pointingandpointing to the previous.Duringimmediate pointingthere was additional activation of left inferior parietal lobule close to the intraparietal sulcus, and when compared withpointing to the previous,dorsolateral prefrontal cortex bilaterally. Duringpointing to the previous,instead, there was additional activation of supplementary motor cortex, anterior and midcingulate, and inferior occipital gyrus in the left hemisphere; superior parietal lobule, supramarginal gyrus, and posterior hippocampus in the right hemisphere; lingual gyri and cerebellar hemispheres bilaterally; anterior thalamus; and pulvinar. The activation of two partially distinct cerebral networks in these two motor tasks reflects the different nature of signal processing involved. In particular, the specific activation of intraparietal sulcus and prefrontal cortex inimmediate pointingappears characteristic of a network for visuospatial working memory. By contrast, the corticolimbic network engaged inpointing to the previouscould mediate spatial attention and the sequence of encoding, recoding, and decoding of spatial memories required by a dual task with two competing targets.

Asymmetry: -0.94592 (left: -1, right: +1)

VRML2 file (161 Kb)

1 Immediate pointing versus fixation. Movement of a stylus with the right hand for the movement of a screen cursor from a central fixation point to an immediate target in the periphery versus passive fixation. WOEXP: 573.
2 Pointing to previous target versus fixation. Movement of a stylus with the right hand for the movement of a screen cursor from a central fixation point to a target in the periphery shown in the previous round versus passive fixation. WOEXP: 574.
3 Pointing to previous target versus immediate target. Movement of a stylus with the right hand for the movement of a screen cursor from a central fixation point to a target in the periphery shown in the previous round versus movement to a target shown just prior to the movement. WOEXP: 575.
4 Immediate pointing versus previous target pointing. Movement of a stylus with the right hand for the movement of a screen cursor from a central fixation point to an immediate target in the periphery versus movement to a target from the previous presentation. WOEXP: 576.


corner cube of WOBIB_182

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