The thalamus acts as the brain's sensory bouncer. In ADHD, the bouncer lets everyone into the club. This 'Sensory Flooding' overloads the auditory cortex. Trying to isolate the frequency of your friend's voice from the frequency of the background music requires immense active effort from the 'Central Executive Network.'
Simultaneously, the 'Task Positive Network' is burning fuel to keep you from interrupting (Inhibitory Control).
When the prefrontal cortex runs out of dopamine and glucose, you experience 'Executive Ego Depletion.' The brain can no longer afford to run the 'Polite Socializing' program. It reverts to the primitive amygdala. The amygdala interprets the loud, chaotic party as a high-threat environment and initiates a 'Flight Response,' flooding you with anxiety until you safely escape to your car.
