Figure 7.

Representation sparseness and glomerular coactivation for alarm and aggregation pheromone. A, Population sparseness and lifetime sparseness measured from l-ALT and m-ALT recordings to alarm and aggregation pheromone compounds. Boxes represent the median and first and third quartiles. Whiskers represent 10% and 90% percentiles. **p < 0.01. B, Glomerular coactivation. Representation for each compound, of the percentage of glomeruli observed in the four classes (for definitions, see Fig. 4B): white represents unique; light gray represents same type; dark gray represents other type; black represents mixed. Only compounds that induced significant activity in l-ALT (top) or m-ALT neurons (bottom) are represented. The majority of glomeruli are mixed glomeruli, being activated both by other compounds of the same pheromone and by other odorants.