To remember the key terms used to describe pavlov's conditioning a dog to salivate at the sound of a ticking metronome, joshua vividly imagined that he was an experimental subject in pavlov's laboratory and that dr. pavlov was conditioning him to salivate. joshua was using to encode the information into long-term memory.

The answer is visual imagery.

Explanation:

Visual imagery is the ability to create mental representations of things, people, and places that are absent from an individual's visual field. This ability is crucial to problem-solving tasks, memory, and spatial reasoning. This helos Joshua to memorize this information and place it in his long-term memory.