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A, response of a MHC to a 550 nm, −1.3 log units, 3000 μm spot of 500 ms duration. The rollback (arrow) in the HC response has a time constant of about 120 ms. B, response of a BHC to a 700 nm, −1.3 log units, 3000 μm spot of 500 ms duration. The time constant of the depolarizing response is about 35 ms. The timing of the stimulus and response scale are shown in the figure.
