ISSN : 1226-9654
Baddeley’s study (1986, 2000) suggesting that phonological loop of working memory consists of phonological store and articulatory rehearsal system used the paradigm that articulation of memory items could be suppressed by rehearsing irrelevant syllables simultaneously in the immediate serial recall task. He did not consider seriously whether articulatory suppression should be covert or overt. Chung et al. (2013) obtained the result that covert articulatory suppression could be automatized and working memory performance could be influenced by this. From the viewpoint of verbal mediation theory (Vygotsky, 1962), repetitive performance could facilitate speech automatization in the covert articulatory suppression condition, but inhibit it in the overt condition. And the effect of speech automatization, if it happens, could be distributed over all the memory items. Experiment 1 probed phonological similarity effect at each serial position of memory items in the covert and overt articulatory suppression condition. The result showed that the covert condition observed generally more accurate responses, and phonological similarity effect at the middle position as well as the late (recent) positions. Experiment 2 probed the repetition effect of performing memory tasks, which showed that the covert condition resulted in generally better performance and the tendency of interaction between articulatory suppression condition and repetition. The results of both experiments could be explained roughly by the speech automatization hypothesis, which suggests that Baddeley’s model of phonological loop should be modified in consideration of automatization of articulatory suppression behaviors. Limitations of this study and suggestions for further study were discussed.
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