According to studies by Ekman and others:

A) no changes in autonomic activities are discernible for emotions such as disgust or anger
B) autonomic changes may be triggered by contractions of specific facial muscles
C) there is no relationship between measures of behavioral, cortical and autonomic arousal
D) emotional reactions are not fully measureable physiologically

Autonomic Changes

Alterations in the involuntary nervous system that regulate bodily functions such as heart rate, digestive processes, and respiratory rate.

Ekman

Refers to Paul Ekman, a psychologist known for his work on the classification of human emotions and their expression through facial gestures.

Behavioral Arousal

The process of becoming alert or energized in response to stimuli, which can influence behavior.