Baddeley, Thomson and Buchanan (1975)
Researchers gave visual presentations of word lists for very brief exposures and asked participants (pp's) to write them down in serial order.
One condition the lists consisted of 5 words taken from one syllable English words such as halm, wit, twice.
Second condition 5 words came from polysyllabic words e.g. organisation and university. Better recollection was found in the short words.
This is called the 'word length effect'.
Conclusion: the capacity of the loop is determined by length of time it takes to say words rather than number of items.
Methodological issues: laboratory experiement using repeated measurements.
Ethical issues: informed consent and debriefing is always necessary.
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