central processing of odor discrimination.

Olfactory information may be tuned along the vertical axis in the olfactory bulb by means of synaptic interactions. The mitral cells have a relatively narrow odor spectrum. In addition, odors may be separated into individual chemical components in the deep olfactory bulb. A further tune of odors may be carried out in the superficial layer of the piriform cortex, whereas the tuned information would be reconstituted in the deep piriform cortex. The fact that neocortical neurons responded exclusively to biological odors could be speculated that selective olfactory information for animal's life needs would be in the neocortex during passing the thalamus.