John Bowlby's theory of attachment was inspired by studies of

The neutral stimulus/unconditioned stimulus pairing:

(a) is nearly automatic after the first presentation (b) must occur several times to reliably produce a conditioned response (c) becomes less intense with each presentation (d) works only in cases involving food

Some Neo-Piagetian theorists argue that the development of operational thinking can best be understood in terms of

A) a sudden shift to a new developmental stage. B) a gradual mastery of logical concepts as children age. C) expansion of information-processing capacity. D) children's interaction with adults and more skilled social models.