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A rod transmits absorption of a single photon by what appears to be a small reduction in the small number of quanta of neurotransmitter (Qcount) that it releases within the integration period (∼0.1s) of a rod bipolar dendrite. Due to the quantal and stochastic nature of release, discrete distributions of Qcount for darkness versus one isomerization of rhodopsin (R*) overlap. We suggested that release...
We can see at light intensities much lower than an average of one photon per rod photoreceptor, demonstrating that rods must be able to transmit a signal after absorption of a single photon. However, activation of one rhodopsin molecule (Rh*) hyperpolarizes a mammalian rod by just 1mV. Based on the properties of the voltage-dependent Ca2+ channel and data on [Ca2+] in the rod synaptic terminal, the...
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