Figure 4
From: Global parameter search reveals design principles of the mammalian circadian clock

Light activated oscillators can drive the SCN. A. 'Jet lag' experiment for 200 neurotransmitter coupled oscillators. 25% of oscillators are light receptive, light intensity = 1.0. B. 'Jet lag' experiment for 200 neurotransmitter coupled oscillators. 25% of oscillators are light receptive, light intensity = 2.0