Positron emission tomography (PET) utilizes which of the following tools?

Which of the following is typically true of parents in the United States?

A) They view an infant's erratic sleep patterns as a normal and healthy part of development. B) They are more likely than European parents to attend to their crying child. C) They view an infant's erratic sleep patterns as a problem that needs to be fixed. D) They are more likely than European parents to ignore their crying child.

In which situation is the reliability of an observation likely to be greatest?

a) The ratings require inference. b) A series of self-observations are used. c) The observation depends on experience. d) Explicit definitions of the observed behavior are used.