DrSanchez Is a Behavioral Psychologist Who Studies Learning and Memory

Multiple Choice

Dr.Sanchez is a behavioral psychologist who studies learning and memory in rats.Because rats are most active at night,she asks the animal resource facility to reverse their light-dark cycle to accommodate her experiments.However,the animal facility is reluctant to disrupt the rats' current ____,which lasts for "about a day."

A) circadian rhythm
B) cerebrodynamic cycle
C) chronometric temperance
D) contrast arousal