Diphasic and monophasic responses in the compound eye of Calliphora

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Abstract

The normal retinogram of the compound eye of Calliphora erythrocephala is diphasic and possesses a flicker fusion frequency of about 240 stim/sec. This is not decreased by light adaptation. Dark adaptation occurs very rapidly. The negative component, which originates from the retinula cells, can be isolated by lowering the partial pressure of oxygen. This component has a low fusion frequency of about 60 stim/sec, which can be strongly reduced by light adaptation. A long time is required for dark adaptation. The positive component is a prerequisite for the resolution of high flicker frequencies. The negative component cannot follow high flicker frequencies. A relationship exists between potential form and inertia of the compound eye, contrary to the assumption of Ruck (1958).

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The investigations reported here were supported by the Deutsche Forschungsgemeinschaft.

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