The estimated prevalence of bulimia nervosa among women across westernized countries is between:

A prototype is:

a) a group of objects sharing some common features. b) the first example of a concept that one encounters. c) the most unusual or distinctive example of a concept. d) the best or most typical example of a concept.

What is the term for the process of concentrating on one limited aspect of a stimulus and ignoring other aspects?

a) symbolic functioning b) language acquisition c) centration d) concrete operations