2019
DOI: 10.1016/j.cub.2019.05.040
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Abstract: Highlights d Primate superior colliculus (SC) is highly sensitive to foveal visual input d SC visually sensitive neurons sample foveolar visual space non-uniformly d SC magnifies foveal visual images in neural tissue as much as primary visual cortex d Tiny foveal stimuli activate large SC tissue area due to fixational eye movements

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Cited by 53 publications
(84 citation statements)
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“…A second mechanistic reason for enhanced times is related to spatial representation itself. Consistent with the large amount of foveal magnification in the SC (Chen et al 2019), the equilibrium idea is actually a natural extension of SC population coding of saccade metrics, but this time to aid in the specification of gaze direction during fixation. Specifically, Sparks and colleagues proposed that "precise saccadic movements are not produced by the discharge of a small population of finely tuned neurons but result from the weighted sum of the simultaneous movement tendencies produced by the activity of a large population of less finely tuned neurons" (Sparks et al 1976).…”
Section: Discussionmentioning
confidence: 90%
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“…A second mechanistic reason for enhanced times is related to spatial representation itself. Consistent with the large amount of foveal magnification in the SC (Chen et al 2019), the equilibrium idea is actually a natural extension of SC population coding of saccade metrics, but this time to aid in the specification of gaze direction during fixation. Specifically, Sparks and colleagues proposed that "precise saccadic movements are not produced by the discharge of a small population of finely tuned neurons but result from the weighted sum of the simultaneous movement tendencies produced by the activity of a large population of less finely tuned neurons" (Sparks et al 1976).…”
Section: Discussionmentioning
confidence: 90%
“…Similarly, in the rhesus macaque SC, while some visual bursts for foveal target onsets might show dependence on foveal eccentricity in their response latency (firstspike latency), this does not seem to be a general property of foveal SC neurons (Chen et al 2019). Specifically, superficial SC neurons (which generally exhibit marginally shorter visual response latencies than deeper SC neurons) show decreases in first-spike latency of the visual response with increasing foveal eccentricity (consistent with our behavioral findings above); on the other hand, deeper SC neurons show no such dependence of visual burst latency on foveal target eccentricity (Chen et al 2019). Since it is the deeper SC neurons that show higher correlations between visual burst latency and saccadic reaction times (Chen and Hafed 2017;Marino et al 2012), this might suggest that increased reaction times for small target eccentricities may not be intrinsically visual in nature (i.e.…”
Section: Discussionmentioning
confidence: 96%
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