Summary
Although numerous studies have demonstrated the detection of polarized light in vertebrates, little is known of the photoreceptor mechanisms involved. Recent evidence, however, indicates that cyprinid fishes possess both ultraviolet (UV) and polarization sensitivity suggesting that some vertebrates, like many invertebrates, may employ UV-sensitive cone receptors in polarization sensitivity. In this report, we describe experiments that determine which spectral types of receptors participate in the detection of polarized light. We used a heart-rate conditioning technique to measure increment thresholds of immobilized goldfish for plane-polarized, narrow-band (10 nm half max.) spectral stimuli (380 nm, 460 nm, 540 nm, 660 nm). A typical experiment involved ‘isolating’ the activity of a cone photoreceptor mechanism by chromatic adaptation and measuring increment thresholds for spectral stimuli at e-vector orientations of the polarizer between 0° to 180° in 30° steps. The UV-, green- and red-sensitive cone receptor mechanisms showed clear evidence of polarization sensitivity while the blue-sensitive cone receptor mechanism was polarizationally insensitive. The average amplitude (base to peak height on Fig. 4) of the polarization sensitivity curves (UV-, green- and red-curves) was 0.67 log unit (standard deviation of 0.12 log unit), with the UV-sensitive cone receptor mechanism most sensitive to the vertical e-vector axis and the green- and red-sensitive cone receptor mechanisms most sensitive to the horizontal e-vector axis. The observation that different cone photoreceptor mechanisms have orthogonal polarization sensitivity in fish suggests that the perception of polarized light may enhance the capacity for visual discrimination in lower vertebrates.
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Hawryshyn, C.W., McFarland, W.N. Cone photoreceptor mechanisms and the detection of polarized light in fish. J. Comp. Physiol. 160, 459–465 (1987). https://doi.org/10.1007/BF00615079
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DOI: https://doi.org/10.1007/BF00615079