Fig. 5. Responses of TuTu1 to dorsal polarized light. (A) Intracellular recording traces of a TuTu1 during stimulation with three polarized monochromatic lights at 9.0x10⁹ photons cm^–2 s^–1. (B) Relative spiking activities at _max (open bars) and response strength R (solid black bars) in response to three polarized monochromatic lights (means ± s.e.m.), *P<0.05; **P<0.01 (t-test). (C,D) Intensity/response curves of neural activity at _max (C) and response value R (D) in response to dorsally presented polarized blue (450 nm) light. Symbol shapes represent different recordings. Maximum intensity (logI=0) is 10.6x10¹² photons cm^–2 s^–1. Solid lines show fits of Naka–Rushton functions with the fitting parameters rA_max=0.96, K=–4.26 log units, n=0.58 (C) and rR_max=0.90, K=–3.19 log units, n=0.66 (D). Broken line in C indicates background activity.