When did the FC leadership know about the fatal flaws with their technique? (Part 1)

The other day, I was listening to a podcast featuring two Speech/Language Pathologists (SLPs) discussing their concerns about the Telepathy Tapes and Spelling to Communicate (S2C). I enjoyed their discussion and their refreshing willingness to question the claims being made by FC/S2C proponents. At one point in their discussion, they pointed out that studies older than 10-15 years often contain…