Dr. Fergus Lowe has conducted numerous studies of fixed-interval performance with humans. In these experiments, participants press a button to obtain points that are later exchanged for money. Although animals develop characteristic pattern of fixed-interval, adult humans do not. Instead, people _____________ .
A. produce an inefficient high, steady rate of response
B. produce an inefficient low rate
C. generally refuse to bar press on fixed interval
D. onlyA. andB.
