Introduction to Psychology 10th Edition by Rod Plotnik,Haig Kouyoumdjian

Exercise 3

The (a) _____ question refers to the relative contributions that genetic and environmental factors make to the development of intelligence. On the basis of twin studies, researchers generally conclude that about (b) _____ of the contribution to intelligence (IQ scores) comes from genetic factors. Adoption and foster-care studies demonstrate that (c) _____ factors significantly contribute to children's intellectual development. Neuroscience research found that the (d) _____, which is involved in attention, self-control, and problem solving, works harder in children from poorer families than in those from higher-income families while completing the same tasks.