The research design in which there are increasing (or decreasing) goal levels for the target behavior is referred to as a(n) ____________ design

Suppose that a psychologist loans you an art book and says that the book includes some interesting ambiguous figure-ground pictures. You should expect to see

a. a random arrangement of black-and-white figures. b. a photo of real-life figures, rather than black-and-white shapes. c. a picture in which a specific region is the central figure one moment, but this region becomes the background the next moment. d. a picture that has at least two subjective contours.

According to the research of Ziviani (1983), the dynamic tripod is usually present in children by age

A. 3 years B. 5 years C. 7 years D. 9 years