In the late 1980s, Richard Davidson at the University of Wisconsin discovered that these asymmetries correlated with a person’s general tendencies to experience positive and negative emotions. People showing more of a certain kind of brainwave coming through the left side of the forehead reported feeling more happiness in their daily lives and less fear, anxiety, and shame than people exhibiting higher activity on the right side. Later research showed that these cortical “lefties” are less subject to depression and recover more quickly from negative experiences.29
