Impulsivity can be a positive influence but more often than not it leads to very negative outcomes. Learners who rush in are unprepared, disorganised and not reflective.  They are usually driven by a belief that responding quickly – before others – defines them as smart.  They have pop-corn brains: ideas bubble up and have to be expressed.  Most are extroverts because they like to vocalise and are overly-confident at being involved.
The marshmallow test highlighted that our ability to control our impulsivity as a toddler increases the chances for success as an adult.
Impulsivity can be managed but first needs to be defined with the behaviours, so the learner can understand, accept and consciously develop strategies to offset the negative attitudes.
Teenage brains are more prone to acting on impulse and risk-taking than adult brains – Jensen.