Neuroimaging research has found that psilocybin increases self-inhibition in visual brain regions and enhances top-down connectivity, leading to vivid, internally generated visual imagery with eyes closed.

How we focus our attention before we even see an object matters. For example, when we look for something moving in the sky, our expectation would be very different if the object is a bird flying past or a baseball coming straight at us.But it’s unclear whether…