This relies on so-called STM, also called "scratch memory", which provides temporary recall information (Peterson, 1993) . STM retains little time and has limited capacity, without repetition, information will quickly be forgotten and cannot be retrieved. The textbook's explanation "STM also retains memory, usually only for 30 seconds, and its ability to store information for a long time is limited unless people use strategies to retain it longer" (Laura , 2013). One article reports on research conducted at the University of Washington to discover STM assistance. In the study, the team let each volunteer visualize five words for 1.5 seconds each, then asked them to try to remember the words for 40 seconds while investigators measured changes in their cerebral blood flow with the positron emission tomography (PET) scanner (Peterson, 1993). ). Researcher Petersen (1993) stated that “both results suggest that a speech-based strategy is most often used to remember spoken and written items; people who silently repeated words over and over performed better than those who tried to remember what the words looked like. like." Volunteers involved in this research use repetition visually and spatially to improve STM because they were not interrupted, making information retained indefinitely. Refer to the textbook, the phonological loop that stores information vocals on the sounds of language help volunteers to use them well during rehearsals (Laura, 2013) In particular, verbal memory seems to work better than visual memory in this research is addressed in another; article Through the study of STM, the author suggests that “degradation of short-term visual memory involves a progressive loss of fine details, as if the memory is blurred by increasingly coarse optics with.