[ And what else could you possibly expect but... ]
In a number of the cultures that believe in the concept of a soul, it is considered to be integrated in the mind. Likely, it is based on the theory defining consciousness as an abstract construct generated by thought, in conjunction with the belief in certain cultures that this consciousness is what would persist after the termination of the lifeform.
[ Wait - he's babbling. He realizes this all at once and actually stops himself. ]
There are chemical components which would contribute to a significant shift in mood in certain humanoid brains. I can appreciate the taste, but such an effect which will continue to elude me.