This is a classic study which would have aided Atkinson and Shriffin's multi-store model.
PROCEDURE
Sperling used a chart with three rows of letters which he showed for v. brief exposures (50 milliseconds) to his participants (P's).
P's were immediately asked to recall as many of the letters a poss. but most could only remember 4/5. H/e, they frequently reported being aware of more letters even though they could no longer recall them.
From this, Sperling decided the alter his experiment, slightly. He trained participants to distinguish three tones; participants would be instructed to recall the top row when signalled a high tone, the middle row for a medium tone and the bottom row if a low tone was sounded.
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