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The encoding of saccadic eye movements within human posterior parietal cortex.

Abstract：

:Over the last few years, several functionally distinct subregions of the posterior parietal cortex (PPC) have been shown to subserve oculomotor control. Since these areas seem to overlap with regions whose activation is related to attention, we used functional magnetic resonance imaging to compare the cerebral activation pattern evoked by eye movements with different attentional loads, i.e., oscillatory saccades with different frequencies, as well as predictable, and unpredictable saccades. Our results show activation in largely overlapping networks with differing strength of activity and symmetry of involved areas. Predictable saccades having the shortest saccadic latency led to the most pronounced cerebral activity both in terms of cortical areas involved and signal intensity. Predictable and unpredictable saccades were dominated by activation within the right hemisphere, whereas oscillatory saccades showing the longest saccadic latency were dominated by activation within the left hemisphere. In all tasks, the centers of gravity of activation occurred within the posterior part of the intraparietal sulcus (IPS), while the predictable saccades additionally activated its anterior part. The enhanced activity during the execution of predictable saccades was probably related to top-down processing and/or the preparation of the upcoming eye movement. The hemispheric difference could arise from a predominant role of the right PPC for shifting spatial attention and the left PPC for shifting temporal attention. The differential encoding of saccadic eye movements within IPS indicates that the PPC splits up into different functional modules related to the particular demands of a saccade.

journal_name

Neuroimage

journal_title

NeuroImage

authors

Konen CS,Kleiser R,Wittsack HJ,Bremmer F,Seitz RJ

doi

10.1016/j.neuroimage.2003.12.039

keywords:

subject

Has Abstract

pub_date

2004-05-01 00:00:00

pages

304-14

issue

1

eissn

1053-8119

issn

1095-9572

pii

S1053811904000187

journal_volume

22

pub_type

临床试验,杂志文章

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