Cannabinoid avoids the pain. Oxytocin grows the act of human.
A neurotransmitter is inhibitory or excitatory.
Cannabinoid neurotransmitter is excitatory in adult, but it
is inhibitory in child. That is well-known.
Cannabinoid neurotransmitter have moved from inhibitory to
excitatory in the process of growth.
We can guess oxytocin neurotransmitter have moved from
inhibitory to excitatory in the process of evolution.
If we could make the oxytocin of an animal move from
inhibitory to excitatory, the brain of the animal changes
into a brain of human.