Fig. 9.

Adaptation and cross-adaptation of AA responses.Top to bottom, Responses to 2-apa, orn, 2-aha, and lys (color scale −0.5 to 5%). Left toright, Consecutive stimuli are given: stimulus itself; adapted with 2-apa; encased, computed difference image (stimulus minus 2-apa response); stimulus itself after recovery period; adapted with orn; encased, computed difference image (stimulus minus orn response); stimulus itself after recovery period. Adaptation with stimulus leads to complete loss of response; cross-adaptation eliminates responses in a subset of glomeruli. Reversal of adaptation is complete (DI for preadaptation/postadaptation comparison in the range of intertrial DIs). Difference images obtained by pixel-wise subtraction mimic adapted responses closely (color scale 0–3%). The somewhat higher noise in the “biological subtraction” is characteristic for single trials. Images for the “digital subtraction” were averaged over four trials and accordingly show less noise. Scale bar, 100 μm.