Fig. 1.

Illustration of group-specific activations with the putative pheromones. The Sokoloff color scale illustrates Z values reflecting the degree of activation (0.0–5.0). Because the same brain section is chosen, the figures do not always illustrate maximal activation for each condition. (Upper) Cerebral activation during smelling of AND and EST. Clusters of activated regions are superimposed on the standard MRI brain (midsagittal plane). (Lower) Significant differences among the different groups. Shown are the clusters calculated with two-group random-effect analysis. Only significant activations are shown.