For some people, the ability to visualize a treasured memory or even a loved one’s face just isn’t possible. New Yorker staff writer Larissa MacFarquhar joins guest host Courtney Collins to discuss a condition that makes it impossible for people to put their thoughts into mental images, the huge effect that has on other parts of their lives and how researchers can use the condition to help study trauma. Her article is “Some People Can’t See Mental Images. The Consequences Are Profound.”