How do we detect the smell of agarbathi ?

Explanation

1) The fore brain is the main thinking part of the brain
2) It has regions which receive sensory impulses from various receptors.
3) Separate areas of the brain are specialized for hearing , smell , sight and so on.
4) Olfactory receptors send the information about the smell of incense stick to fore brain .
5) The fore brain integrates it along with information received from other receptors as well as with information that is already stored in the brain .