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10 - Signal Detection Theory: How to Detect the Important Signal against the Distracting Background and Take Action as Appropriate Based on the Signal

from Part III - Applications, Examples, and Selected Topics

Published online by Cambridge University Press:  23 October 2025

Harvey J. Langholtz
Affiliation:
William & Mary
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Summary

How do people determine if they are hearing a faint sound or if they are hearing only background noise? How do people differentiate between important information and distractions? Signal detection theory was first developed as a model for understanding and interpreting electronic signals in early radar. The model was quickly adopted to explain people’s perception and sensation of light and sound.

Signal detection theory, with a …criterion or detection threshold that separates hits from misses and correct non-detections from false alarms… is a model for any decision-making setting that requires the decision maker to make a binary decision based on the presence or absence of the signal. Signal detection is explicitly understood and used in medical testing, fire detection, spam detectors, shoot/don’t shoot decisions by police and the military, psychophysics, artificial-intelligence algorithms, and in a variety of other settings.

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Publisher: Cambridge University Press
Print publication year: 2025

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References

Recommended Reading

Green, D. M., & Swets, J. A. (1966). Signal detection theory and psychophysics (Vol. 1, pp. 1969–2012). Wiley.Google Scholar
Kahneman, D., Sibony, O., & Sunstein, C. R. (2021). Noise: A flaw in human judgment. Little, Brown.Google Scholar
Silver, N. (2015). The signal and the noise: Why so many predictions fail – but some don’t. Penguin.Google Scholar

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