Consider the following tree diagram: 
Which of the following nodes are root nodes?
Definitions:
Cannon-Bard Theory
A theory in psychology that suggests emotions and physiological responses such as heart rate increase occur simultaneously.
Guilty Knowledge Test
A psychological assessment used in criminal investigations that measures physiological responses to determine whether the subject knows details about a crime.
Spillover Effect
Occurs when the feelings, thoughts, or behaviors in one domain of an individual's life influence the same aspects in another domain.
Cannon-Bard Theory
A theory of emotion that argues that physiological arousal and emotional experience occur simultaneously, not sequentially, following an emotional stimulus.
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