The application of signal detection theory to letter recognition

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Abstract
Signal Detection measures were used to assess tachistiscopic recognition of single target letters or pairs of targets, embedded in strings of non‐targets whose shapes were eithor similar or dissimilar to the targets. Sensitivity was worse, and there was a stronger response bias towards reporting targets, when similar non‐targets were used. Ss who were informed about the nature of the non‐targets showed little change in sensitivity, but a marked reduction in false alarms with similar non‐targets.

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