"Participants were randomly assigned in approximately equivalent numbers to one of two groups, one of which received the meditation training while the other gro

"Participants were randomly assigned in approximately equivalent numbers to one of two groups, one of which received the meditation training while the other group listened for equivalent periods of time to a book (J.R.R. Tolkein's The Hobbit) being read aloud." So does this mean that meditation helps cognition, or listening to "The Hobbit" hurts cognition?