At this age, infants intentionally avert their gaze from overstimulating stimuli. In addition, quinolinic acid is associated with overstimulating NMDA receptors on motor neurons. He finds the journey overstimulating and stressful, but succeeds and is welcomed by his mother. In nature, the interfering items are said to originate from an overstimulating environment. She ultimately kills her husband herself by overstimulating his weak heart during sex.