In "fast" micrographia, written letters are microscopic from the outset, sometimes approximating to a straight line, though produced at normal speed without fatigue. This pattern has been observed in progressive supranuclear palsy and with globus pallidus lesions, and contrasts with the "slow" micrographia, writing becoming progressively slower and smaller, seen in idiopathic Parkinson’s disease.
Quinn NP. Fast micrographia and pallidal pathology. Journal ofNeurology, Neurosurgery and Psychiatry 2002; 72: 135 (abstract)