Fig. 3.

Cortical odor response patterns are similar among individuals. (A) Diagrams show the locations of c-Fos⁺ neurons in the left and right APC of two mice for each of the odorants indicated, and the number of c-Fos⁺ neurons in each cortex (see Fig. 2 legend). Different animals exposed to the same odorant are specified by numbers (either 1 or 2). The two hemispheres are indicated (left or right). Below the diagram for each odorant is shown the average number of c-Fos⁺ neurons per cortex ± SD. The four odorants activated different, but partially overlapping, patterns of neurons, which are similar in the two hemispheres and in different individuals. (B) A 292-box grid was superimposed on each diagram in A, and each box containing two or more c-Fos⁺ neurons was marked in blue to clarify the patterns elicited by each odorant. Because the APC is 10.5 mm² (28), each box represents an ≈190-um² segment of the APC. (C) Colored boxes are those that are marked in B in at least three of the four APC diagrams for each odorant. The colored boxes represent hot spots of activation for each odorant. They are distinct, but partially overlapping, for the four odorants.