Nonlinear dynamic transfer characteristics of cells in the peripheral visual pathway of flies

White noise modulated stimuli were employed for studying the transfer characteristics of the intracellularly measured retinula cell responses of the chalky mutant of the blowfly Calliphora erythrocephala Meig. Average depolarization levels varied between 6 and 20 mV. Response modulation depths of up to ±44 % could be achieved. The analysis of the stimulus-response relationship, which takes into account nonlinear properties of the receptor cell response, reveals, that this system is essentially linear for an intermediate frequency range between approximately 5 and 30 Hz. For higher as well as lower frequencies the system becomes increasingly nonlincar.

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