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Address correspondence to Dr. Mikko Juusola, Physiological Laboratory, Downing Street, University of Cambridge, Cambridge CB2 3EG, UK. Fax: 44-1223-333-840; email: mj216{at}cus.cam.ac.uk; or Dr. Gonzalo Garcia de Polavieja, Department of Theoretical Physics, Facultad de Ciencas, C-XI, Universidad de Madrid, Cantoblanco Madrid 28049, Spain. Fax: 34-91-397-3936; email: gonzalo.polavieja{at}uam.es
We present a method to measure the rate of information transfer for any continuous signals of finite duration without assumptions. After testing the method with simulated responses, we measure the encoding performance of Calliphora photoreceptors. We find that especially for naturalistic stimulation the responses are nonlinear and noise is nonadditive, and show that adaptation mechanisms affect signal and noise differentially depending on the time scale, structure, and speed of the stimulus. Different signaling strategies for short- and long-term and dim and bright light are found for this graded system when stimulated with naturalistic light changes.
Key Words: vision • neural coding • neuron • photoreceptor • fly
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