Describe key characteristics of the four phases involved in attachment formation in infancy. Explain goal-corrected partnership, and give an example to support your thinking.

Concepts are ideas that represent _____

A) a class or category of objects, events, or activities that share core properties B) patterns of behavior C) higher-order conditioning and secondary reinforcers D) tangible objects

Two groups of people are given different kinds of practice problems in logic. They are then tested on a set of new problems to determine whether one kind of practice was better than the other. The nature of the practice problems is the ______ variable

a. observed b. uncontrolled c. dependent d. independent