Eight-month-old Landon loves to hear himself talk. He babbles "ma ma ma ma" over and over. Soon he found that whenever he made the sounds "ma ma ma," his mother would come and give him lots of positive attention. Landon soon began to associate the sounds "ma ma ma" with his mother and would say the sounds whenever he wanted her. This illustrates

Sally has a favorite stuffed toy. Sometimes she just looks at it, sometimes she will suck on its ear, and sometimes she will lie on it as if it were a pillow. These behaviors demonstrate the information-processing concept of

allowances. perception. affordances. habituation.

Leo worries all of the time. He worries about his money, his children, and his dog

His muscles are always tense and sore, he has trouble sleeping, and is constantly physically tense. Leo's symptoms sound most like _____. A) panic disorder B) conversion disorder C) generalized anxiety disorder D) a dissociative disorder