The following is an excerpt from Scientific American:
Psychologists have been interested in empathy for decades, but the approach of bringing in neuroscience to study the emotion is only in its adolescence. The first decade or so of work focused on establishing the independent yet interacting neural networks that underlie emotional and cognitive empathy. In 2004 neuroscientist Tania Singer, now at the Max Planck Institute for Human Cognitive and Brain Sciences in Leipzig, Germany, and her colleagues published a groundbreaking paper in Science that compared brain activity in a person experiencing pain with the same person's brain activity when observing a loved one experiencing pain. Sixteen women underwent functional magnetic resonance imaging while their male partner sat nearby. Varied levels of painful stimulation were administered by an electrode to one or the other partner. A signal alerted the women when their partner was feeling pain. Some areas of the women's brains were activated only on receiving pain themselves, but others—most notably parts of the anterior insula and the anterior cingulate cortex—lit up no matter who was hurting. Empathy activated the affective, or emotional, parts of the pain network but not the physical sensation of pain. That study and the many imaging studies that followed indicate that our core ability to empathize begins with the way the brain represents our own internal states and evolved to include our perception of what others are feeling.
I don't quite understand the last sentence: why is "evolved" instead of "evolves" used? What should be the subject of the verb "evolved"? If one parses this sentence, what are the two parts that the conjunction "and" right in front of "evolved" connects?