FIGURE 3. Calcium responses in AIB and AIY interneurons.

a, b, Representative and average calcium responses of AIB interneurons in wild-type and AWC-ablated animals on odour addition (a) or removal (b). Bar graphs, average percentage change during the 10 s after odour addition or removal (highlighted in yellow; n = 22 wild type, 7 AWC-ablated). c, Average AIB responses on odour removal (10 s) and re-addition (40 s). d, Average AIB responses to odour removal after different exposure times. e, f, Representative and average calcium responses of AIY neurites from wild-type and AWC-ablated animals on odour addition (e) or removal (f) (n = 35 wild type, 8 AWC-ablated). g, h, Averaged AWC^ON (n = 30), AIB (n = 59) and AIY (n = 35) responses, each trace normalized to its maximum response, on odour addition (g) and removal (h). Shading denotes the presence of odour. The shaded region around curves (c, d, g and h) indicates s.e.m. The colour key for bar graphs is the same as that for the corresponding response curve. Error bars indicate s.e.m.