ABSTRACT
Cognition is a synthesis of many psychological functions, including spatial and time orientation, object recognition, skilled movements, the ability to elicit appropriate information from memory at the time needed, language comprehension, arithmetic calculation, reasoning, imagination, and problem solving. In the clinic, a wealth of information is obtained through the observation of spontaneous speech. As the examinee narrates the reason why he or she needs help, for example, the examiner pays attention to the form, content, and use of the language. Language, an important source of information in the clinic, needs to be either completely eliminated or accounted for in epidemiological studies on the effects of neurotoxic agents. Dementia is a sustained, multidimensional loss of cognitive functions resulting from central nervous system damage. The association between lead absorption and performance in the adult at different levels of lead absorption was also studied by J. A. Valciukas and R. Lilis.
