Very interesting, and many thanks. One of the main takeaway from this should be (at least, it was for me):
It is of course possible that serifs or the lack of them have an effect on legibility, but it is very likely that they are so peripheral to the reading process that this effect is not even worth measuring (Lund, 1999)
It is of course possible that serifs or the lack of them have an effect on legibility, but it is very likely that they are so peripheral to the reading process that this effect is not even worth measuring (Lund, 1999)