This week, The Naked Scientist, Dr Chris Smith explains why yawning is contagious and that humans yawn to improve arousal and alertness. Yawning occurs to cool your brain because a tired brain is a hotter brain.
Yawning in sympathy with other people yawning is a brain cooling manover to increase alertness.— Chris Smith, The Naked Scientist
Answering a twitter question as to why babies gesticulate when they are emoting with their legs, the naked scientist said that this was due to the fact that humans aren't fully developed when they are born, thus their brain motor pathways respond a certain way.
We are born absolutely useless and were it not for our parents, we wouldn't survive five minutes.— Chris Smith, The Naked Scientist
The Naked Scientist answered different other questions from listeners. Listen below to this insightful interview.