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Spectral effects of the pupil in fly photo receptors


, : Spectral effects of the pupil in fly photo receptors. Journal of Comparative Physiology A Sensory Neural & Behavioral Physiology 146(2): 145-152

Photoreceptors of flies contain pigment granules which upon illumination of the receptors migrate towards the rhabdomere and act as a longitudinal pupil. Data in the literature concerning the effect of the pupil on the spectral sensitivity are contradictory. Therefore spectral sensitivity of Musca photoreceptors upon light adaptation was reinvestigated. The change in spectral sensitivity of fly photoreceptors upon light adaptation as measured by Hardie (1979) was confirmed. Taking into account waveguide optics this change was explained from absorbance spectra of pupillary granules, measured by microspectrophotometry in squash preparations. Pupil absorbance spectrum determined in vivo was interpreted. The absence of a change in spectral sensitivity upon light adaptation measured by pupillary reflexion is explained by a local triggering of the pupil.

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Related references

Vogt, K.K.rschfeld, K.S.avenga, D., 1982: Spectral effects of the pupil in fly receptors. Journal of comparative physiology A: Sensory neural and behavioral physiology B: Biochemical systemic and environmental physiology46(2): 145-152

Blakeslee B.; Howard J.; Laughlin S., 1984: The role of the fly pupil mechanism in regulating the signal to noise ratio of light adapted photo receptors. Neuroscience Letters (SUPPL 15): S20

Ohba N., 1970: The effects of real and bleaching background on the photo pupil response. Investigative Ophthalmology 9(7): 554

Mcreynolds, J.S.; Gorman, A.L.F., 1970: Membrane conductances and spectral sensitivities of pecten irradians photo receptors. Journal of General Physiology 56(3): 392-406

Baylor D.A.; Nunn B.J.; Schnapf J.L., 1984: Photo current and spectral sensitivity of visual receptors of macaca fascicularis. Biophysical Journal 45(2 PART 2): 294A

Horridge G.A.; Mimura K.; Tsukahara Y., 1975: Fly photo receptors part 2 spectral and polarized light sensitivity in the drone fly eristalis. Proceedings of the Royal Society of London Series B Biological Sciences 190(1099): 225-238

Alexandridis E.; Koeppe E.R., 1969: The spectral sensitivity of retinal photo receptors conducting the pupillary light reflex in man. Albrecht Von Graefes Archiv fuer Klinische und Experimentelle Ophthalmologie 177(2): 136-151

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