Excerpt: Beyond simply discovering the functional contribution of these neo-neurons, the study has also reaffirmed the clear link between “mood” (defined here by a specific pattern of stimulation) and cerebral activity. It has been shown that curiosity, attentiveness and pleasure all promote the formation of neo-neurons and consequently the acquisition of new cognitive abilities.
My comment: The mouse model is one in which olfaction and odor receptors clearly link the role of nutrient chemicals in ecological niches that calibrate intracellular signaling and the development of social niches, which are standardized and controlled by pheromones that control species specific behaviors. Because the molecular biology is the same across species with or without eyes or a central nervous system, olfaction and odor receptors provide a clear evolutionary trail that can be followed from unicellular organisms to insects to other mammals and humans.
The idea that ecological niches and social niches are the determinants of neurogenic niches, like those that develop with exposure to food odors and social odors, is one that is important to consider whether we intend to look at pharmacogenomics or to better understand the development of human behavior in the context of epigenetic effects of odors on brain development. The role of odors and neo-neurons is one that can be examined in a model of adaptive evolution and behavioral development. These results attest to the fact that my model is the right one.