By G. Underwood (Auth.)
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The model is given considerable support by data reported by Weiss and House (1973), who found a REA for vowels in a dichotic listening task with unfavourable Immediate (Sensory ) Memory 51 listening conditions (a S/N ratio of -12 dB). In this situation distinctive features between the vowels are degraded during input and so the adverse effects of storage in acoustic memory are increased, the distinctive features of left ear vowels being lost. This is a crucial experiment, for Liberman's encoding model would not consider that because a vowel is degraded it becomes more encoded, perceived categorically, and therefore entitled to a REA.
The problem is that to perform adequately the subject need not process the whole of each word as it was presented. A valid strategy for a subject would be to remember six initial letters, and at the end of the presentation decode these letters into words using the complete set of stimuli which Morton et al provided for them. Since every word started with a different letter there was no chance of confusion. , should this be decoded as "buU, cow, dog" or as "bowl, cup, dish"? As presentation of the Hsts to the subjects was in blocks, that is 20 Hsts composed of words from one category, a per missible strategy would be to listen to a single word from the first Hst in each block, encode the category of that word and only decode letters from that block of lists into that category.
An incidental point is that our conclusion that human noise is necessary for a suffix effect to appear is now invalidated. A synthetic suffix can affect recency if recency itself is produced with synthetic stimuU, and provided that the vowels of the recall items carry information. These two experiments permit us to reject the hypothesis that acoustic memory records all speech information - the perfect tape-recording model - and suggest that only vowels are held in PAS. This could be due to different perceptual functions, with consonants being decoded in differ ent ways to vowels as Liberman et al suggest, or to storage functions, with consonants having a shorter Hfe in PAS.
Attention and Memory by G. Underwood (Auth.)