Abstract
Thalamic relay neurons process visual signals from retina on the way to cortex, and seem to encode the information in dual modes: tonic spiking and bursting. The mode of firing depends critically on the history of membrane potential. For example, when the membrane rests at levels close to the firing threshold, relay neurons generate tonic spikes, but when the membrane is sufficiently hyperpolarized by IPSCs, they produce bursts. Therefore, it seems that the visual signal from retina to cortex is not only transferred but also transformed by thalamus.
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