To ensure that pigeons are strongly motivated to respond for food, they are generally

A) ?food deprived for at least 12 hours prior to each session.
B) ?kept at starvation level.
C) ?kept at 80-85% of their free-feeding weight.
D) ?Both b and c are correct.


C

Psychology

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A group of people who move through life with an individual, providing protection and encouragement, is called a ______

Fill in the blank with correct word

Psychology

If the nominal interest rate is 6 percent and the rate of inflation is 2 percent, then the real interest rate is

a. -4 percent.
b. 2 percent.
c. 4 percent.
d. 8 percent.

Psychology

Baby Li is participating in a research study in which his physical growth is measured once a day. Li's parents were surprised to find out that monthly measurements of height showed gradual increases, but daily measurements revealed growth spurts that sometimes lasted up to 24 hours. This example supports the assertion that physical growth is ______.

A. primarily characterized by continuity B. primarily characterized by discontinuity C. both continuous and discontinuous D. continuous usually followed by discontinuous

Psychology

__________ percent of U.S. children under the age of 18 live with two married parents, down from 77 percent in 1980

a) 64 b) 45 c) 54 d) 70

Psychology