Parkinsonism is generally considered to be essentially a disturbance of motor function, yet it is frequently accompanied, according to some writers (Hughes, 1961; Macdonald Critchley, 1955; Niehbuhr, 1961), by some degree of intellectual deterioration, especially in the later stages of the illness.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.