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Related Experiment Videos

Filter-mediated color vision with one visual pigment

K L Kong, Y M Fung, G S Wasserman

    Science (New York, N.Y.)
    |February 15, 1980
    PubMed
    Summary

    Grasshopper compound eyes show true color vision. Alternating clear and brown bands, with a single visual pigment and optical filters, enable spectral discrimination and color preference behaviors.

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    Area of Science:

    • Entomology
    • Animal Vision
    • Sensory Neuroscience

    Background:

    • The compound eye of the grasshopper Phlaeoba exhibits distinct alternating clear and brown bands.
    • Previous studies suggest potential variations in visual processing between these bands.

    Purpose of the Study:

    • To investigate the spectral sensitivity and color vision capabilities of the Phlaeoba grasshopper's compound eye.
    • To determine the underlying mechanisms responsible for spectral discrimination in this species.

    Main Methods:

    • Electroretinograms (ERGs) were recorded from individual eye bands to determine action spectra.
    • Spectrally selective adaptation experiments were conducted on the whole eye.
    • Behavioral tests involved spontaneous choices between stimuli of varying wavelengths and intensities.
    • Experimental manipulation of eye bands by painting was performed.

    Main Results:

    • Clear bands peaked at 525 nm, brown bands at 545 nm, suggesting a single visual pigment altered by screening pigments.
    • Whole-eye adaptation yielded identical action spectra, supporting the single pigment hypothesis.
    • Behavioral tests demonstrated a preference for green over red stimuli, even with intensity variations.
    • Color vision was dependent on the presence of both clear and brown bands.

    Conclusions:

    • Phlaeoba grasshoppers possess true color vision.
    • This color vision is mediated by a single visual pigment combined with optical filtering mechanisms in the eye bands.
    • The distinct spectral sensitivities of the clear and brown bands are crucial for behavioral color discrimination.

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