“…These include the (a) *ength cf time passing between a response and receipt of KR, i.e., KR-delay, (b) amount of time passing between KR and the next response, i.e., post-KR delay (see Figure 8 for the relationship between KR-Delay and post-KR-Delay intervals), (c) precision of KR, (d) frequency of KR, and (e) when KR is withdrawn during training. Slower learning occurs only when KR is delayed beyond perfomance of the next trial or response (Becker, Mussina, & Per.ons, 1963;Lavery, 1964;Lorge & Thorndike, 1935;Shea A Upton, 1976).…”