WOBIB: 45 - Ellermann, et al. (1998) Activation of visu ...
 
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J. M. Ellermann; J. D. Siegal; J. P. Strupp; T. J. Ebner; K. Ugurbil. Activation of visuomotor systems during visually guided movements: a functional MRI study. Journal of Magnetic Resonance 131(2):272-285, 1998. PMID: 9571103. WOBIB: 45.

The dorsal stream is a dominant visuomotor pathway that connects the striate and extrastriate cortices to posterior parietal areas. In turn, the posterior parietal areas send projections to the frontal primary motor and premotor areas. This cortical pathway is hypothesized to be involved in the transformation of a visual input into the appropriate motor output. In this study we used functional magnetic resonance imaging (fMRI) of the entire brain to determine the patterns of activation that occurred while subjects performed a visually guided motor task. In nine human subjects, fMRI data were acquired on a 4-T whole-body MR system equipped with a head gradient coil and a birdcage RF coil using a T2*-weighted EPI sequence. Functional activation was determined for three different tasks: (1) a visuomotor task consisting of moving a cursor on a screen with a joystick in relation to various targets, (2) a hand movement task consisting of moving the joystick without visual input, and (3) a eye movement task consisting of moving the eyes alone without visual input. Blood oxygenation level-dependent (BOLD) contrast-based activation maps of each subject were generated using period cross-correlation statistics. Subsequently, each subject's brain was normalized to Talairach coordinates, and the individual maps were compared on a pixel by pixel basis. Significantly activated pixels common to at least four out of six subjects were retained to construct the final functional image. The pattern of activation during visually guided movements was consistent with the flow of information from striate and extrastriate visual areas, to the posterior parietal complex, and then to frontal motor areas. The extensive activation of this network and the reproducibility among subjects is consistent with a role for the dorsal stream in transforming visual information into motor behavior. Also extensively activated were the medial and lateral cerebellar structures, implicating the cortico-pontocerebellar pathway in visually guided movements. Thalamic activation, particularly of the pulvinar, suggests that this nucleus is an important subcortical target of the dorsal stream.

Asymmetry: 0.11228 (left: -1, right: +1)

VRML2 file (168 Kb)

1 Cursor movement with joystick. Movement of a cursor controlled with right hand through a joystick from the center of the screen to one of eight positions arranged radially and further to a new position at the same angle but further away from the center. WOEXP: 148.


corner cube of WOBIB_45

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