Corey, J. R. & Shamow, J. (1972). The effects of fading on the acquisition and retention of oral reading. Journal of Applied Behavior Analysis, 5(3), 311-315.
Comparisons were made between reading programs that involved superimposition of correlated pictoral and printed stimuli, fading of the pictoral stimuli, and overt observing (touching) responses. Nursery school children aged 4 to 5.8 yr learned and retained oral reading behavior better when fading was used; observing responses had no effect.