Two Brains, One Movie: teacher key

Friendship, grade 10 edition, written for 10th grade. Scientists scanned brains as friends watched movies. The results sit beside studies of hours, baboons and children's minds.

Read the book. Print this page for the key.

Questions and answers

1. How many first-year graduate students had their network mapped?
   • 42
   • 279 (answer)
   • 355
2. What happened to neural similarity as two people were farther apart in the network?
   • It grew
   • It stayed the same
   • It shrank (answer)
3. What do the movie-watching results suggest about friends?
   • Friends' brains responded more alike to the same movies than distant people's did (answer)
   • Friends dislike movies
   • Scanners cannot see faces
4. What does the baboon finding say about number versus quality of relationships?
   • More friends is always better
   • Quality and stability matter more than number (answer)
   • Baboons have no friends
5. What does homophilous mean?
   • Afraid of crowds
   • Fond of music
   • Tending to be friends with people like themselves (answer)

Words

• homophilous: drawn to similar
• fMRI: brain scan
• embedded: settled in
• grooming: cleaning each other