Fig. 3. Responses of LoTu1 to unpolarized monochromatic lights applied from three different directions. (A) Intracellular recording traces of responses to three unpolarized monochromatic lights (UV, 350 nm; B, 430 nm; G, 530 nm) at different intensities. Positive deflections in the traces below the spike trains indicate duration of light stimuli. Maximum intensity of each monochromatic light stimulus (0 log) was 16.5x10¹² photons cm^–2 s^–1. Stimuli were given from the zenith (Dors), ipsilateral (Ipsi, 30–45° elevation) and contralateral (Contra, 30–45° elevation) directions. Blue light from dorsal and contralateral directions leads to inhibition (arrows) followed by rebound excitation after stimulation (open arrowheads). When light stimuli were applied from the ipsilateral direction, the neuron was inhibited by UV light (arrowhead) and excited by green light (double arrowhead). (B) Responses to three unpolarized monochromatic lights at 16.5x10¹⁰ photons cm^–2 s^–1. In each graph, activities to the three monochromatic lights are shown before stimulus onset (Pre, open bars), during stimulation (Stim, black bars), and after stimulation (Post, grey bars). LoTu1 is significantly inhibited by dorsal blue and green light and is excited by ipsilateral green light: *P<0.05; **P<0.01 (t-test). (C) Intracellular recording showing the responses to nine unpolarized monochromatic lights from the ipsilateral direction at 16.5x10¹⁰ photons cm^–2 s^–1. Lights at short wavelengths (330–430 nm) inhibit (arrowheads) and green lights (500–550 nm) excite the neuron (double arrowheads).