Figure 1
From: Fast PCA for processing calcium-imaging data from the brain of Drosophila melanogaster
Odor coding. An odor molecule is encoded as a pattern of glomerulus responses in the ALs of the fruitfly brain. The green and yellow glomeruli remain inactive (not shown), whereas the blue and magenta glomeruli respond to the odor presentations (black bars mark two pulses of 1s each) with differential strength. Left and right ALs, that receive input from the left and right antennae, are mirror-symmetric and contain the same types of glomeruli.