A simple model of human foveal ganglion cell responses to hyperacuity stimuli |
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| Authors: | Thomas Wachtler Christian Wehrhahn Barry B Lee |
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| Institution: | (1) Max-Planck-Institut für biologische Kybernetik, Spemannstr. 38, 72076 Tübingen, Germany;(2) Max-Planck-Institut für biologische Kybernetik, Spemannstr. 38, 72076 Tübingen, Germany;(3) Max-Planck-Institut für biophysikalische Chemie, 37077 Göttingen, Germany |
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| Abstract: | We developed a physiologically plausible model of the first steps of spatial visual information processing in the fovea of the human retina. With the predictions of this model we could support the hypothesis that, for moderate contrasts ( 40%), hyperacuity is mediated by the magnocellular (MC-) pathway. Despite the lower sampling density in the MC pathway, as compared to the parvocellular (PC-) pathway, the information that is transferred by the MC ganglion cells is sufficient to achieve thresholds comparable to those of human subjects in psychophysical tasks. This is a result of the much higher signal-to-noise ratio of the MC pathway cell signals. The PC pathway cells do not transfer enough information for hyperacuity thresholds. |
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| Keywords: | primate retina simulation ganglion cells spatial vision hyperacuity |
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