Figure 5. The effect of adaptation on the odour-induced spike firing response.

Suction current response family to a 4 s pre-pulse of increasing concentration as indicated beside each trace, followed by a test pulse at a fixed concentration of 20 μm cineole. Current traces low-pass filtered at 500 Hz, and are individual responses. Top trace represents the timing of the solution change. Same cell as Fig. 4. During the experiment the cell was repositioned in the tip of the suction pipette, leading to the collection of an increased proportion of the receptor current from the cell body. Therefore all current traces have been normalised to the maximal current elicited by a 300 μm test pulse in the absence of an adapting pre-pulse.