In order to test the memory of rats, Stacey trained them to…

In order to test the memory of rats, Stacey trained them to press a lever to earn food whenever they heard an 800-Hz tone. A week later, the rats were exposed to a variety of different tones in order to determine whether they would respond preferentially to the correct tone. Experiments like this demonstrate that the act of remembering can often be thought of as an instance of ​ _____.