DescriptionEffect of frequency difference on direction of drug name auditory perception errors.jpg
English: Direction of substitution errors as a function of difference in log prescribing frequency. The bar chart is a histogram of frequency differences between stimulus names and substituted names. The bottom part of each vertical column represents the number of times the substituted name was less frequently prescribed than the stimulus name (left axis). The top portion represents the number of times the substituted name was more frequently prescribed than the stimulus name. The line represents the percent of substitution errors wherein the substituted name was more frequently prescribed than the stimulus name (right axis). The graphs show that when one name is mistaken for another, the substituted name is almost always more frequently prescribed than the name which was misheard. The probability of error is not a symmetrical function of similarity. Relatively low frequency names are liable to be misheard as their higher frequency neighbors, but not vice versa.
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