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Fig. 1. Morphology and physiology of a LoTu1 neuron. (A) Schematic representation
of the locust brain with arborization pattern of the polarized-light sensitive
LoTu1 neuron. AL, antennal lobe; AOTu, anterior optic tubercle; Ca, calyces of
mushroom body; CB, central body; LAL, lateral accessory lobe; Lo, lobula; Me,
medulla. Scale bar: 200 µm. (B) Top trace shows mean spiking activity
(moving average, bin width 0.5 s), middle trace shows intracellular recording
of a LoTu1 neuron during zenithal stimulation with polarized light (Dors
pol-light). Rotation of the polarizer through 360° (bottom trace) leads to
e-vector-dependent changes in spiking activity. (C) Mean spiking activity and
intracellular recording of responses to unpolarized white light applied from
contralateral (C), ipsilateral (I), frontal (F) and dorsal (D) directions (150
W halogen bulb, spectral range: 
400–800 nm; visual angle: 3°;
frontal: 13 µW cm–2; contralateral, ipsilateral, dorsal:
2–4 µW cm–2). Positive deflections in the bottom
trace indicate duration of light stimuli.
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