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Response profiles of an ON and an OFF ORN from the same sensillum during a series of 6 alternating upward and downward concentration ramps at a rate of +50%/s and −50%/s, respectively. (A) responses of the ON ORN (green). (B) responses of the OFF ORN (blue). Yellow regions show time course of concentration change. Impulse frequencies determined for impulse counts of 0.1 s intervals.
