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• W100697762 abstract "The data reviewed here suggest several relationships between the superior colliculus, pulvinar and saccadic eye movements. These will be summarized in a series of steps in the visual initiation of saccadic eye movements. Area Pdm of the pulvinar appears to be involved in visual spatial attention. As such it may participate in the earliest decisions to make an eye movement: the shift of attention. This function is suggested by the spatially selective enhancement seen in the activity of individual neurons and the effects of drug injections on attentional performance. The attentional function of area Pdm is probably accomplished in coordination with cortical area 7 and possibly other areas. The spatially non-selective enhancement found in PI and PL may precede or follow the enhancement in Pdm. The next oculomotor function may be played by the visual cells in the superficial layers of the colliculus. Here the enhancement effect appears to be related to target selection which is specifically used with saccadic eye movements. Lesions here lead to animals who are not easily distracted by peripheral events; they do not select saccade targets. Thus the visual regions of the superior colliculus and Pdm may provide separate initiatives to the saccadic system. Once the eye begins to move, there are many relations manifested in both brain areas. Many of the visual collicular cells and those in parts of the pulvinar are unresponsive to visual stimuli during eye movements. In the colliculus, this particular effect may function to minimize erroneous visual targets whereas in the pulvinar the process may be more important perceptually. Finally there is a population of cells in the pulvinar which discharge during and after saccadic eye movements. These cells may have a role in the termination of one attentional scan and the beginning of the next. The pathways through which these effects may be mediated are totally unclear. The visual signal from the superficial layers related to saccade initiation may impinge directly on the cells in the intermediate layers or may reach the oculomotor system through other pathways. The parts of the pulvinar which relate to visual spatial attention are interconnected with posterior parietal cortex and probably function in concert with that area. How those data get to the oculomotor system has yet to be determined. Since the pulvinar is extensively interconnected with the cortex, it is most likely through this route that eye movement information coming from the superior colliculus is brought to higher perceptual areas.(ABSTRACT TRUNCATED AT 400 WORDS)" @default.
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• W100697762 date "1989-01-01" @default.
• W100697762 modified "2023-09-23" @default.
• W100697762 title "The visual superior colliculus and pulvinar." @default.
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