No doubt this is a reasonable inference chain that was dreamed up many decades ago. But science doesn't stop at inference chains. Now, armed with this hypothesi

No doubt this is a reasonable inference chain that was dreamed up many decades ago. But science doesn't stop at inference chains. Now, armed with this hypothesis, we have to go and actually look. Which bacteria? How do they influence the brain? What evolutionary pressures exactly? Reading the article, it looks like we have answers to many of these questions.