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Abstract
An analysis of the temporal frequency properties at the lateral geniculate nucleus (LGN) and visual cortex (VC) levels during the phases of the sleep-wakefulness cycle (SWC) was carried out. The results indicated a poor selectivity in the filter properties of the LGN for the different stages of the SWC, showing no differences in the handling of visual flicker information at this level. However, at the cortical level, filter properties were clearly affected by the SWC; thus, clear differences were observed between the synchronized phase of sleep (SS) and the desynchonyzed stages (W and PS). For the first time different functional temporal frequency channels at the cortical level closely related with the states of the SWC in cats are reported.