Used correlation functions obtained in 2 experiments with undergraduate Os (N = 10) as a basis for describing human visual letter recognition. Visual images were filtered by means of autocorrelation for pattern information. This operation gave the relative visibilities or legibilities of the characters. The visual impressions were then cross-correlated with a set of memory records whose outputs described the relative probabilities that the stimulus was a given character. This operation described confusion errors. Finally "response bias" was described in terms of the reliability with which a memory record provides identification of a given stimulus. In these terms response bias represented an attempt by the recognition system to minimize errors in high-information responses, at the expense of producing more low-information responses as errors. (French summary)
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