This effect helps to explain why the odor preferences of mammals, including humans, appear to develop before birth, but it probably has nothing to do with visual input except via its association with olfactory/pheromonal input, neurogenesis, learning and memory.
“Symptoms” of well-understood brain activity are clearly established via rewards and experience-dependent conditioned preferences that depend on hormonal changes driven by the effects of odors. Food odors and social odors elicit these “symptoms” of activity
I’ve culled these comments from wikipedia as a means to collect some of my thoughts. If ever I can determine how to get permission to edit the wikipedia pages, I will update the information there.
Those who continue to deny the importance of human pheromones will be among those who are replaced by a new generation that better understands molecular biology and thereby establishes a new scientific truth.
Peer-reviewed journal articles detail the effects of natural odor from women on hormone levels in men, which are linked to behavior. Pheromone-enhanced fragrance products enhance the natural odor of women and can enhance attraction.
The molecular mechanisms of bacterial conjugation are lovingly extended to marital love, philosophically and biochemically.
…he also said that chemical signals between organisms can change genetic expression. This allows the social environment to modify gene expression in individuals and in their offspring.
Copulins are olfactory/pheromonal stimuli from women (human pheromones) that appear to condition increased testosterone and sexual arousal in men.