Journal of comparative physiology

, Volume 93, Issue 4, pp 337–346 | Cite as

Spectral sensitivity of monopolar cells in the bee lamina

  • Randolf Menzel
Article

Summary

  1. 1.

    The intracellularly recorded response of the lamina monopolar cells (MC's) to retinal illumination is a triphasic hyperpolarisation (Fig. 1). Recordings stable enough to allow measurement of a whole series of intensity and spectral runs were obtained from 9 cells.

     
  2. 2.

    The gain between retinal input and MC output is calculated by comparison of normalised response/log intensity functions, and is found to be about 7 over most of the MC's dynamic range (Fig. 2, 3).

     
  3. 3.

    The spectral sensitivity of MC's has its maximum at 482 nm and a broad shoulder around 550 nm. Sensitivity is low (20%) in the UV. However, in some MC's there is an increase in sensitivity to the shortest wavelengths tested (316 nm). One MC (No. 7) responded to UV wavelengths at only high intensities and then with a depolarising potential.

     
  4. 4.

    The interpretation of the MC's spectral sensitivity function is that blue and green receptors supply excitatory inputs to the MC with about equal weighting. UV receptors may supply inhibitory inputs with less weight than those from the blue and green receptors.

     
  5. 5.

    These spectral sensitivity functions of dark adapted MC's are calculated for an intensity range which is near the threshold of the receptors. For an intensity range which lies around 50% response of the receptors the spectral sensitivity function of the MC's is flat between 300 and 600 nm (if there is no or only small inhibition by the UV receptors) or between 400 and 600 (if the UV inhibition increases strongly with intensity). It is discussed that the spectral response in light adapted MC's may be very different from those of dark adapted MC's.

     

Keywords

Short Wavelength Equal Weighting Spectral Response Intensity Function Spectral Sensitivity 

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Copyright information

© Springer-Verlag 1974

Authors and Affiliations

  • Randolf Menzel
    • 1
    • 2
  1. 1.Department of NeurobiologyAustralian National UniversityCanberraAustralia
  2. 2.Fachbereich Biologie-ZoologieTechnische Hochschule DarmstadtDarmstadtFederal Republic of Germany

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