Key structural and functional differences
Full maturation by mid-20s. Consistent executive function enables planning, impulse control, and working memory without significant effort.
Steady, regulated dopamine release. Adequate dopamine transporter levels allow consistent motivation for both routine and novel tasks.
The prefrontal cortex effectively modulates amygdala responses. Emotional reactions are proportional and recovery from distress is relatively quick.
DMN deactivates cleanly when task-positive networks engage. Smooth transitions between rest and focus states.
Capable of sustained effort toward delayed rewards. The value of future outcomes is estimated accurately.
Relatively accurate internal clock. Can estimate durations and pace activities over time without significant difficulty.
Structural differences and delayed maturation (up to 3–5 years). Reduced cortical thickness leads to inconsistent executive function — planning, prioritising, and impulse control are effortful and unreliable.
Higher dopamine transporter density clears dopamine too rapidly from synapses. Creates a chronic motivational deficit for non-stimulating tasks. The brain craves novelty and intensity to compensate.
Weaker prefrontal-amygdala connectivity means emotions hit harder, faster, and take longer to recover from. Rejection sensitivity, frustration intolerance, and emotional flooding are common.
DMN intrudes during tasks — it doesn't fully switch off. This causes mind-wandering, daydreaming mid-task, and difficulty sustaining attention without high-interest triggers.
Steep temporal discounting — distant rewards feel almost invisible. The brain strongly prefers immediate payoff, making long-term projects and goals extremely difficult to sustain.
Cerebellar differences impair the internal clock. Time blindness causes chronic lateness, difficulty estimating task duration, and a distorted sense of past vs. future time.