They used E-set letters consisting of the letters B, C, D, E, G, P, T, V and Z to perform the recognition experiment.
Participants were instructed to verbally rehearse the memory set letters throughout the retention interval and to respond whether a memory probe letter appearing at the end of the interval was present or absent in the trial set.
Once the type was cast, it had to be set letter by letter into the presses: a 1965 Heidelberg Platen press and a 1970 Vandercook proofing press.
Introduced in the late 1800s, it rapidly replaced the art of setting metal letters by hand with a new set of skills -- operating a Linotype machine.
Favero [15] also proposed speech-recognized model on E-set letters.
He expanded the duration of the consonants to gain a high characteristic difference between confusable pairs in the E-set letters.
In both experiments, a printed version of the relevant stimulus set (letters or digits) was placed in front of the subjects.
In 2013 he set up Letters Live, "a celebration of the enduring power of literary correspondence" based in part on Shaun Usher's Letters of Note books.
The "easy" set of letters were: T, L, B, R, S or T, C, B, P, S; and the "difficult" set of letters were: O, A, N, E, G or I, F, N, E, G.
