Mongolism, now known as ___________ syndrome, is a disorder produced by the presence of an extra chromosome on the 21st pair

The independent variable in an experiment is

a. the subject him or herself. b. a measure of the subject's behavior. c. the variable that the experimenter chooses to manipulate. d. any unwanted variable that may adversely affect the subject's performance.

The process by which people concentrate on particular skill areas to compensate for losses in other areas is called __________

a) expertise b) sensory memory c) long-term memory d) selective optimization