In hypokalemic sensory overstimulation, relative insensitivity to lidocaine has been described in people who also have attention deficit hyperactivity disorder.
The ability to wait or seek immediate reinforcement is related to avoidance-related behaviors such as procrastination, and to other clinical diagnoses such as anxiety, attention deficit hyperactivity disorder and depression.
This may also be due to a non-academic family background, a personal psychological trait such as attention deficit hyperactivity disorder, or because they are boys.