Abstract
THE EFFECT OF VARYING THE STIMULUS INTENSITY (LOUDNESS) ON THE RECALL OF 9-DIGIT SEQUENCES WAS STUDIED USING 2 PRESENTATION RATES. AT 1 DIGIT/SEC AND WITH INSTRUCTIONS FOR 3, 3, AND 3 REHEARSAL GROUPING, STIMULUS INTENSITY WAS FOUND TO BE A VARIABLE ONLY IN THE CASE OF THE LAST 3 DIGITS, WHICH ACCORDING TO REHEARSAL INSTRUCTIONS WERE UNREHEARSED. NO EFFECT WAS FOUND ON THE 1ST 6 REHEARSED DIGITS. AT 4 DIGITS/SEC, A RATE TOO FAST FOR SYSTEMATIC REHEARSAL, THE STIMULUS INTENSITY AFFECTED THE RECALL OF THE 1ST 6 AND THE LAST 3 DIGITS. THE RESULTS ARE DISCUSSED IN RELATION TO THE QUESTION OF WHETHER OR NOT THE STIMULUS AND REHEARSAL MEMORY TRACES SHOULD BE REGARDED SEPARATELY. THE QUESTION OF PRESENTATION RATE AND PERFORMANCE IS ALSO DISCUSSED.
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