The prefrontal cortex (PFC) is the neurological center for executive functioning. It relies heavily on optimal levels of dopamine and norepinephrine to operate. In ADHD, the reuptake transporters for these neurotransmitters are overactive, scrubbing the chemicals from the synapses before they can properly transmit signals.
Because the PFC is chemically starved, the brain's 'CEO' cannot issue effective commands to the rest of the brain. Dr. Russell Barkley, a leading ADHD researcher, conceptualizes ADHD entirely as an Executive Functioning Development Disorder. He points out that the capacity to self-regulate behavior toward future goals (the definition of executive function) is delayed by approximately 30% in individuals with ADHD.
Furthermore, the deficit is highly context-dependent. Executive functioning in ADHD is state-dependent, meaning it fluctuates wildly based on the level of interest, novelty, urgency, or fear present in the environment. This inconsistency is what frustrates both the individual and their peers: the same brain that cannot initiate a 5-minute math worksheet can flawlessly execute a 6-hour complex video game raid, because the video game provides artificial, high-intensity executive scaffolding.
