Release from proactive interference in short-term memory as a function of change in visual and phonemic structure and retention interval

Abstract

Experiment 1 demonstrated that in a short-term memory (STM) test series, a shift from a horizontal arrangement of the consonants comprising visually presented trigrams to a vertical arrangement, with phoneme class held constant, produced a highly significant release from proactive interference (PI). Release from PI was also observed with a shift from one phoneme class to another with spatial arrangement held constant. The effects of visual change and phoneme change were independent of each other. Experiment 2 verified the PI release effect of phoneme class change but failed to confirm an observation in Experiment 1 that the effect of phoneme change was a function of the retention interval. The results were discussed in relation to interpretations of PI in STM and the interpretation of STM as a linguistic system.