A stronger unity of mind, body and soul comes with every insight or intuition or act of benevolence or agony or ecstasy a person has. This stronger unity is a higher level of consciousness. In sleep consciousness dissolves. The essence of consciousness, its powers and qualities and memories, are retained in the parts . As consciousness dissolves unconsciousness fills the space.
Emotion occurs somewhat like the way consciousness occurs.
The difference is that consciousness requires that the parts be at least partially enmeshed. Emotion will occur simply by the parts touching each other. I say emotion in the singular because such a simple creature has only one emotion. That emotion is the fundamental emotion, or instinct, of survival. Surviving means eat and multiply.