Research into the Role of the US in Determining the Nature

Multiple Choice

Research into the role of the US in determining the nature of the CR suggests which of the following is true?

A) The US is important to the form of the CR only if different CSs are used.
B) The US only determines if the CR is an approach or avoidance response.
C) The US only determines if the CR is vigorous or weak.
D) The US determines many aspects of the CR, including very specific aspects of mouth and tongue movements.