In negative punishment, the probability of a response ________ over time when a stimulus is ________

Chapter 13 discussed research conducted in China on infants' ability to recognize their mother's voice one or two weeks before the infants were born. In one condition, infants heard their mother's voice reading a poem

This research was appropriately conducted because, in the second condition, infants heard a. their mother reading the same poem at a different time. b. their mother reading a different poem. c. another mother reading a different poem. d. another mother reading the same poem.

According to a national study of American families, about what percentage of children have used a computer by 3½ years of age?

a. 25 b. 60 c. 75 d. 90