How big is a cricket's brain?

In researching information on keeping a cricket as a pet, most online guides state that a cricket's brain is not very large in relation to its body mass. This statement is usually followed by the fact that they need a sponge or very shallow water to drink from, as their brains are "so small" that they will drown themselves attempting to drink from deeper standing water. (Not a very scientific answer I realize, but I figured this answer would be a good place holder in the meantime).