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Do Flies Have A Red Receptor?

T H Goldsmith1

  • 1Department of Biology, Yale University, New Haven.

The Journal of General Physiology
|October 30, 2009
PubMed
Summary
This summary is machine-generated.

The Musca compound eye lacks a distinct red receptor. Spectral sensitivity variations are due to ommatidia stimulation, not different photoreceptor types.

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Area of Science:

  • Vision science
  • Insect physiology
  • Photoreception

Background:

  • The compound eye of Musca displays spectral sensitivity and action potential variations, previously interpreted as evidence for color receptors.
  • Mazokhin-Porshnyakov calculated a
  • red receptor
  • based on colorimetric data from rapid color substitutions.

Purpose of the Study:

  • To investigate the presence of a distinct red receptor in the Musca compound eye.
  • To determine if spectral sensitivity variations are due to different photoreceptor types or other mechanisms.

Main Methods:

  • Comparing the action spectrum for red enhancement with Mazokhin-Porshnyakov's calculated
  • red receptor
  • .

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  • Analyzing spectral sensitivity and retinal action potentials in wild-type and white-eyed Musca mutants.
  • Examining the effect of ommatidia stimulation number on visual responses.

    • Main Results:

    • The action spectrum for red enhancement and the calculated
    • red receptor
    • share maxima at 615-620 nm, suggesting they represent the same phenomenon.
    • A distinct red receptor is absent in Musca.
    • Spectral sensitivity variations in the 500-700 nm range are explained by differential stimulation of ommatidia, influenced by pigment screening and light leakage.

    Conclusions:

    • The observed spectral characteristics of the Musca compound eye do not indicate the presence of separate red receptors.
    • Variations in ommatidia stimulation, including spatial summation from light leakage, account for the observed spectral responses.
    • Further research into the role of screening pigments and ommatidia recruitment is warranted.