5ht can be thought of as placing the brain into a state of consciousness appropriate for an animal in his nest ( i.e. , 5ht neurons act as relaxers ) , and as involved in a type of positive affect related to security , whereas ne neurons are dominant when an animal is vigilant , foraging out in the environment and are involved in a type of positive affect related to goal-directed approach arousal .
C0039869
thought
C0006104
brain