Länk - Din blinkhastighet visar din dopaminnivå

However, a far more interesting determinant of spontaneous eye blink rate appears to be levels of cortical dopamine. If dopamine receptor 1 activity is enhanced (with D1 agonists), eye blink rate increases, and if it is blocked, eye blink rate decreases. Likewise, monkeys treated with MPTP (known to cause Parkinsonian type symptoms, a disorder associated with decreased dopaminergic activity) show reductions in eye blink rate, which is remediated by administration of D1 agonists (as are the Parkinsonian symptoms). This relationship is also robust in human populations, where people with schizophrenia show elevated blink rates and those with Parkinson's show the opposite trend