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Double-cone internal reflection as a basis for polarization detection in fish
I Novales Flamarique1, C W Hawryshyn, F I Hárosi
1Laboratory of Sensory Physiology, Marine Biological Laboratory, Woods Hole, Massachusetts 02543, USA. inovales@uvvm.uvic.ca
Summary
Fish can detect polarized light using specialized retinal cones. This study reveals how partitions within these cones act as dielectric mirrors, converting light polarization into intensity signals for fish vision.
Area of Science:
- Vision science
- Animal behavior
- Biophysics
Background:
- Fish can perceive light polarization, a capability beyond intensity and color.
- The visual mechanisms underlying polarization detection in fish are not fully understood.
Purpose of the Study:
- To investigate the optical properties of fish retinal cones responsible for polarization vision.
- To elucidate the mechanism by which fish photoreceptors transduce polarized light signals.
Main Methods:
- Optical experiments using polarization microscopy on trout and sunfish retinal cones.
- Measurement of linear birefringence and linear dichroism.
- Histological analysis.
- Optical model measurements and theoretical calculations using Fresnel's formulas.
Main Results:
- Paired retinal cones exhibit anisotropic light transmission.
- Measured linear birefringence supports the presence of membranous partitions within cones.
- These partitions likely function as dielectric mirrors, reflecting and refracting polarized light.
Conclusions:
- Membranous partitions in fish paired cones act as dielectric mirrors.
- This mechanism explains how polarized light is converted into intensity variations detected by photoreceptors.
- The findings provide a biophysical basis for polarization vision in fish.
