Figure 9.

Very important odorant-evoked responses are spared following large bulbar lesions. A: Ventral-centered 2D charts show domains as in Figure 4 as well as color-coded z score responses to the odorants L-carvone and D-carvone averaged across six rats each (Linster et al., 2001). A semi-transparent, stippled overlay simulates a lesion removing 80% of the glomerular layer, including all of the lateral aspect. The area not covered by this overlay would be spared after such a lesion. The spared area includes at least a portion of five identified response domains as labeled in Figure 4. The spared area also includes the main differential response between L- and D-carvone (black arrow). B: This same spared region is shown on a 3D model of the glomerular layer viewed from a medial perspective. The representations of odorants that persist in this posterior part of the medial aspect of the bulb can explain the spared discriminatory powers of rats given such bulbar lesions.