Which of the following disorders are serious mental impairments in old age caused by the deterioration of the brain?

As we view the world, objects often appear to stand out against a backdrop. This is the Gestalt principle of _____

a) similarity. b) proximity. c) figure-ground. d) continuity.

When a child understands that even though you change the shape of a piece of clay you still have the same clay, we say that the child understands

a. reciprocity. b. reversibility. c. classification. d. identity.