A mother waking to a quiet murmur from her baby, but not to other sounds while she is asleep, is an example of signal detection theory because a meaningful stimulus is detected against other background sounds.

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Signal detection theory provides a framework for understanding how motivation, expectations, and other factors influence our ability to detect a meaningful stimulus against background noise. It is one of the primary theories used to explain why certain sensations lead to conscious perception while others do not.

Signal Detection Theory

Spielman, R. M., Jenkins, W. J., & Lovett, M. D. (2020, April 22). Psychology (2nd ed.). OpenStax. https://openstax.org/books/psychology-2e/pages/1-introduction

OpenStax Psychology (2nd ed.) Textbook

Example of Signal Detection Theory: Mother and Baby

Signal detection theory has significant practical applications, notably in improving the accuracy of air traffic controllers. Controllers must identify and track plane signals, or 'blips,' on a radar screen that contains numerous other distracting signals. The theory was originally developed to enhance their ability to perform this critical task of distinguishing important signals from background noise.

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