What psychological purpose does nostalgia serve? Is it good or bad? Are we more nostalgic today in our hectic, connected world? Is there such a thing as the “good ‘ol days”? Here to help explain is Dr. Krystine Batcho, professor of psychology at LeMoyne College in Syracuse, New York. She’s an expert on nostalgia and developed the Nostalgia Inventory, a survey that assesses proneness to personal nostalgia.