Beth received a painful shock while turning on her television. Now she reacts with fear whenever she sees a television. What is the television in this example?

What is the capacity of short-term memory?

a) five, plus or minus two letters b) five, plus or minus two engrams c) seven, plus or minus two chunks d) seven, plus or minus two numbers

A dog whistle can be heard by dogs but not by humans. This whistle takes advantage of a characteristic of sensory systems known as

a. the absolute threshold. b. the difference threshold. c. perceptual defense. d. a just noticeable difference.