The laughter of tiny babies is not just a phenomenally popular theme for YouTube videos, it is also a fantastic window into the workings of the human brain. You can’t laugh unless you get the joke. At the University of London's Birkbeck Babylab we study how babies learn about the world. We believe that studying early laughter in detail will throw new light on the workings of babies’ brains, as well as offering new insights into the uniquely human characteristic that is humor.

We are researching just what makes babies laugh by conducting the largest ever global survey of early laughter. If you are parent with a child under two, you can take the survey. It takes about 15-20 minutes to complete.

We are also interested on particular incidents that made your baby laugh. Who was present? What was so funny? You can file a 'field report'.