Statistics and quantum bumps in arthropod photoreceptors.
Discrete waves of depolarizing membrane potential in arthropod photoreceptors, called quantum bumps, appear to result from single-photon absorptions of the visual pigment. Statistical analysis of bump records suggest a model for bump occurrence in dark-adapted receptors at low levels of illumination. This model assumes that a photon that isomerizes a visual pigment molecule can trigger a stochastic process that can produce no more than one bump under normal conditions, and that the stochastic processes triggered by different isomerized visual pigment molecules are independent of each other.
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D000818:Animals; D001181:Arthropods / Q000502:physiology*; D004175:Diptera; D004307:Dose-Response Relationship, Radiation; D006110:Grasshoppers; D006737:Horseshoe Crabs; D007473:Ion Channels / Q000502:physiology; D008027:Light; D008564:Membrane Potentials; D010786:Photoreceptor Cells / Q000502:physiology*; D012243:Rhodopsin / Q000502:physiology; D013269:Stochastic Processes; D014785:Vision, Ocular
D007473:Ion Channels; D012243:Rhodopsin