What explains time blindness from a neurobiological perspective?

Time blindness is not a motivation problem. It is a neurobiological one. In ADHD, the brain systems that track time, predict duration, and shift attention between now and next work differently. Time is processed less as a steady internal signal and more as something that becomes clear only when there is urgency, novelty, or an external cue. Without those markers, time can feel vague or invisible. Several brain networks are involved. The prefrontal cortex helps with planning and estimating how long things will take. Dopamine pathways help signal importance and reward over time. In ADHD, dopamine signaling is less consistent, which means the brain has trouble using time as a guide unless something feels immediately engaging or urgent. That is why deadlines can suddenly snap things into focus. Another factor is working memory. To sense time passing, the brain has to hold multiple reference points in mind. What time it is now, what comes next, how long tasks usually take. When working memory is taxed, time tracking becomes unreliable. This is why people with ADHD often experience time as now or not now. The future does not feel real until it becomes pressing. It is also why external time supports like timers, alarms, schedules, and visual clocks are so effective. They replace an internal signal that is inconsistent with an external one that is clear. Time blindness is not carelessness or immaturity. It reflects how the ADHD brain processes reward, attention, and prediction. When time is made visible and concrete, performance often improves dramatically, which tells us this is about wiring, not effort.