People with ADHD suffer from impulsivity, which means acting without thinking beforehand.
Generally, until people are in their early twenties, their decision making and responses take place in the limbic area--the "emotional brain." There is less inhibition and evaluation of consequences, but as they mature, they begin to respond with the frontal cortex--the "rational brain."
However, individuals with ADHD respond primarily with their limbic area instead of their frontal cortex. So they act or react immediately, without thinking of the potential consequences.
People with ADHD can work on skills and strategies of delaying gratification and evaluating consequences, as well as medication if necessary.
Source: The Disorganized Mind, Nancy A. Ratey, 2008
Daniel H. Lee
This blog will be dedicated to sharing in three areas: happenings in my classroom and school; analysis and distillation of other educators' wealth of knowledge in various texts; insights from other disciplines and areas of expertise that relate and connect with educational practices.