What common measure of fear or anxiety is popular because it can be used with non-humans as well as humans?

Question

Quizplus · Accepted Answer

The startle response is a common measure of fear or anxiety that can be observed in both humans and non-humans, making it a popular choice in research that involves animals. This reflexive response involves a quick, automatic reaction to a sudden and unexpected stimulus, such as a loud noise or a sudden movement. The startle response can be measured using a variety of techniques, including electromyography (EMG), which measures muscle activity, and behavioral observation, which involves watching for physical signs of the response.

What Common Measure of Fear or Anxiety Is Popular Because