The most specific diagnostic feature is the supranuclear vertical gaze palsy (inability to look up and down). Difficulty moving one's eyes in the downward direction is particularly suggestive of the ...

pseudobulbar palsy, axial parkinsonism, supranuclear vertical gaze palsy, executive dysfunction, apathy, disinhibition and bradyphrenia. Corticobasal degeneration (CBD) is characterized by either ...