HUMAN CODE TRANSMISSION LETTERS AND DIGITS COMPARED ON THE BASIS OF IMMEDIATE MEMORY ERROR RATES

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Abstract
Experiments are described which were set up to study in information-theory terms some aspects of so-called ‘ immediate memory ’ in the retention of codes consisting of letters find digits. The results show that errors began to occur when the codes presented more than about 20 bits. This result held for both letters and digits, so that single presentations of four letters or five digits were almost always reproduced without error. Differences in performance among subjects were not characterized by a shifting of the point at which errors began to occur but rather by the percentage of information above 20 bits that could be transmitted.

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