Venting reinforces negative emotions

Think of our brain circuitry like hiking trails. The ones that get a lot of traffic get smoother and wider, with brush stomped down and pushed back. The neural pathways that sit fallow grow over, becoming less likely to be used. Kindergarten teachers are thus spot on when they say, “The thoughts you water are the ones that grow.” This is also true for emotions, like resentment, and the ways we respond to them, like venting. The more we vent, the more likely we are to vent in the future. 

Gail Cornwall & Juli Fraga writing in Slate