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Kinesiology 3480A/B notes nov 5.docx

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Kinesiology 3480A/B
Matthew Heath

Brown-Peterson Task - classic study - as long as it is rehearsed, it will persist in STSS; but other stimuli distract - how long can unrehearsed info persist in STM? AND are there interference effects in the STM? (their research objectives) - participants given a trigram, then asked to count backwards from some random number (prevents rehearsal; distractor task); then asked to recall the trigram - seems simple but it is not - speaks to how fleeting (short-term) it is and how susceptible it is to interference effects Typical Results of the Brown-Peterson Task - graph: recall accuracy - x-axis - how long before you were asked to recall (backward counting task length) - monotonic/decreasing ability to recall the trigram as a function of the increasing delay interval - provided them with a basis of the interval for how long info can last in STM - 50% (reliable recall) - around 3 sec - found: info that is unrehearsed can persist in STM for around 3 seconds - not as fleeting as STSS (300ms) Brown-Peterson Task - another thing they found as a consequence of their results - found: linear reduction in recall accuracy as a function of number of recall trials (more trials = worse recall) - why did this performance decrement occur? - anecdotal finding from original study - created a second study for why this occurred - participants only did 4 trials - control = same 4 trials as first study (always presented and asked to recall a trigram) - experimental = same thing, but on 4th trial they were asked to recall 3 numbers instead of a trigram - switched the semantic category associated with the to be recalled stimuli on the 4th trial - graph: actual data - control - same result as in first experiment - experimental - mirrors performance of control, 4th trial goes back up to almost 100% recall accuracy - speaks to the semantic/categorical nature associated with short term/working memory - categorical information is susceptible to interference effects - found: STM susceptible to proactive interference (what you are currently trying to learn is impaired by stuff that you previously learned) Proactive and Retroactive Interference - proactive interference: the forgetting of currently learned material produced by interference from previously learned material - the 3 previous trigrams impaired the person’s ability to recall the 4th trigram (Brown-Pete
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