Which of the following substages marks the arrival of intentional, or goal-directed, behavior?
a. the use of reflexes
b. the use of coordination of secondary circular reactions
c. the use of secondary circular reactions
d. the use of primary circular reactions
B
Psychology
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The heroin on the streets today is ______ than that available in the 1930s and 1940s
a. weaker and less addictive c. weaker, but more addictive b. stronger, but less addictive d. stronger and more addictive
Psychology
Initially infants are only able to bat at objects; they then learn to grasp them utilizing their whole hand. Later, infants are able to pick up small objects with just their index finger and thumb. This illustrates the ___________ principle
a. cephalocaudal c. hierarchical integration b. proximodistal d. independence of systems
Psychology