For more than 20 years, Elaine Aron, PhD, has been studying highly sensitive people: individuals with a particular genetic characteristic that makes them keenly attuned to the world around them. Because they process sensory input more deeply than others, HSPs tend to be more empathetic and thoughtful, but they're also easily overstimulated and require frequent respites of peace and quiet. Aron's quiz can help you determine whether you share this trait. For each statement, select the ranking that best describes you.