Additionally, patients have an intact ability to attend to cued stimuli. Gemination cued by final stressed vowels, however, is transparently phonological. This set-up allowed them to compare the perception of attended (cued) and non-attended stimuli (uncued). Many studies use cued recall to retrieve memories. Another study done using cued recall found that learning occurs during test trials. Animated sequences would be cued to the guitar parts. Sperling also showed this with his experiment of cued recall. Godfrey broke down in tears and cued the listeners back to the studio. There are three main types of recall&colon; free recall, cued recall and serial recall. No major differences among word cued, interview, focused and exhaustive recall have been found. The theory can also account for cued recall. This cued the theater projectionist to activate the Percepto! This method of therapy can cause spontaneous recovery that is cued from the therapists questioning. The breeding activity and reproductive phenology of toads, however, are cued by moonlight. These speakers are cued to lift to show position at 2+ hours before showtime.