From: Michael Brady
The same thing happens to me.
The reason is probably something Kevin Larson [apparently]
elaborated upon at the Vancouver ATypI conference, which I
however think applies only to the fovea, and only partially:
we can compile words through parallel resolution of letters.
An enecdotal indication that bouma processing also happens
in the fovea is something like "readjust": it takes you a
while before you can read it as anything except "read" and
"just" stuck together. And in the parafovea it's the rule.
The basic reason that boumas are more important in immersive
reading overall is that it's simply faster to read clusters
of letters as wholes, which is possible to do with repeated
exposure to them.