So school work becomes the discriminator of who has attentional deficits. Sustained, directed attention is probably the weakest neuropsychological function of the brain and gives out in stressful situations in contrast with other faculties such as long term memory or motor skills, which stay firm. Impulsiveness Young children are neurologically immature. They take no time to consider consequences. In a biological sense, maturation is a development of inhibitory system or the ability to suppress and meter immediate impulses and emotions.
Maturity comes with age, both conventionally and neurologically.
The part of their brain responsible for slowing down before taking action is not fully developed yet. This happens for most children, but not for all. Teachers complain and you begin to worry about your child. As children grow older, the process of self-evaluation improves. Development of impulse control takes place in the prefrontal lobes of the brain together with the control of emotional expressions.