John T. Cacioppo, scientist of loneliness who expanded psychology’s reach, dies at 66
Colleagues remember life and research of Prof. John T. Cacioppo

Lonely people become self-centered as an evolutionary response to protect themselves
Prof. John Cacioppo discusses study linking loneliness and self-centeredness

Loneliness can be depressing, but it may have helped humans survive
Prof. John Cacioppo examines the evolutionary need for loneliness
