Turtle dorsal cortex (dCx), a three-layered corticalarea of the reptilian telencephalon, receives inputsfrom the retina via the thalamic lateral geniculate nu-cleus and constitutes the ﬁrst cortical stage of visualprocessing. The receptive ﬁelds of dCx neuronsusually occupy the entire contralateral visual ﬁeld.Electrophysiological recordings in awake and anes-thetized animals reveal that dCx is sensitive to thespatial structure of natural images, that dCx recep-tive ﬁelds are not entirely uniform across space,and that adaptation to repeated stimulation is posi-tion speciﬁc. Hence, spatial information can be fou ndboth at the single-neuron and population scales.Anatomical data are consistent with the absence ofa clear retinotopic map ping of thalamocortical pro-jections. The mapping and representation of visualspace in this three-layered cortex thus differ fromthose found in mammalian primary visual cortex.Our results support the notion that dCx performs aglobal, rather than local, analysis of the visual scene.
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