text: Pilley and Reid used play-rewards to teach over a thousand words to one of these animals named Chaser.
full_question: Pilley and Reid used play-rewards to teach over a thousand words to one of these animals named Chaser. In an experiment partly conducted by Steven Maier, three groups of these animals were subject to electric shocks in shuttle boxes; those who had previously received “inescapable” shocks demonstrated learned helplessness, according to Martin Seligman. A social scientist developed the theory of classical conditioning while working with these animals, who would salivate at the sound of a bell for feeding time. For 10 points, name these animals studied by Ivan Pavlov.
first_sentence: Pilley and Reid used play-rewards to teach over a thousand words to one of these animals named Chaser.