A flash of light evokes biphasic spike responses in the dLGN. The primary somatosensory cortex (S1) and hippocampus were partially removed and the dLGN was exposed to allow routine electrophysiological recordings. A flash was presented to the contralateral eye. Recordings were obtained from urethane-anesthetized (A, B) and awake (C) mice. A, Three representative peristimulus time histograms (PSTHs) of spikes in multiunit recordings from anesthetized mice. B, Data from 36 unit recordings from 20 mice were pooled. C, Three representative PSTHs of spikes in multiunit recordings from awake mice.