Animals used in the laboratory are Holtzman male albino rats that were purchased from a commercial supply house. They are docile animals and have been raised in a germ free environment. They will be approximately 100 days old at the beginning of the semester.

The rats are individually housed in a special Animal Care Facility. They are fed Laboratory Rat Chow once a day for approximately one hour. This is an adequate diet and insures a high activity level for the experimental period. On experimental days, feeding will occur shortly after the laboratory session. Water is available in the home cage at all times.