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. 2021 Nov 26;12:738229. doi: 10.3389/fphys.2021.738229

Figure 2.

Figure 2

Multi-frequency organisation of oscillatory signals in the SVS. (A) Black and red sinewaves, respectively, representing the oscillatory relationship between spontaneous firing and Per1 expression over a 24-h period ex vivo. The dotted black line in the olivary pretectal nucleus (OPN) is an extrapolation based on two daily time points. The horizontal black line in the dorsolateral geniculate nucleus (DLG) demonstrates a lack of daily rhythms in neuronal activity ex vivo. The red sinewave represents rhythmic core clock gene Per1 expression in the SVS areas, with a dotted red line in the DLG coding its rhythmicity in vivo only. (B) Infra-slow rhythm is modulated by ambient light conditions. White bar shows light-adapted conditions, whereas black bar – dark-adapted recording. Note the enhanced frequency in darkness for most SVS areas, or a total silencing in the intergeniculate leaflet (IGL). (C) Gamma oscillation presented as the notable bands in the instantaneous frequency (IF) plots and as a multimodal inter-spike interval (ISI) histogram. The IGL stands an exception, with no gamma oscillation recorded in this structure. IB, intra-burst; EB, extra-burst phase; SCN, suprachiasmatic nucleus; SC, superior colliculus.