But still within the body, and thus within this universe - in any case it's just a matter of definition of what the "brain" is, and we could just as well say the whole human is a brain, and emotions are just an effect of the "computation" that it performs. Whether this computation is electrical or chemical (hormones) doesn't change the fact that it's based on the same laws of interaction as everything else in the universe.
But still within the body, and thus within this universe - in any case it's just a matter of definition of what the "brain" is, and we could just as well say the whole human is a brain, and emotions are just an effect of the "computation" that it performs. Whether this computation is electrical or chemical (hormones) doesn't change the fact that it's based on the same laws of interaction as everything else in the universe.