attention, memory, perception, and comprehension. In The Man Who Mistook His Wife for A Hat and Other Clinical Tales by Oliver Sacks, we follow the stories of many people who have lost their judgment, have lost their memory, and people struggling with different diseases. According to our lecture material, cognition is manipulation of representations. In this essay I analyze how cognition can help explain several stories in the book, including The Man Who Mistook His Wife For A Hat, The Lost Mariner, and