Fig. 7: Hypothetic model of SCN circuit for circadian photoentrainment.

Proposed bi-stable functional circuit within the SCN comprised with 3 distinct groups of neurons according to Fig. 6b (classification), 6c (average light response) and Supplementary Fig. 12 (dynamic response). Group 1 and 2 neurons are outcome units to drive phase shift at delay or advance time respectively. Group 3 neurons are the computational unit using populational dynamic coding. Right part: diagram of average group 1-3 neuronal response.