Statistical Analysis of Quantum Bump Parameters in Limulus Ventral Photoreceptors

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Abstract
A statistical analysis of current quantum responses (“bumps”) to the absorption of single photons in the ventral photoreceptor of Limulus is presented. The analysis is performed in terms of bump parameters among which two groups are distinguished: “time-like parameters” with distributions independent of individual cells and “current parameters” the distribution of which differ for different cells. The analysis yields a set of “primary” parameters with mutually uncorrelated fluctuations. The results are interpreted by a new model formulation on the basis of a transmitter hypothesis for the transduction. The model separates latency from amplification and postulates the existence of different sources of fluctuations among which one includes individual cell properties.

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