When more than one signal is present, the FM receiver is likely to demodulate only the strongest signal. What is this behaviour called?

The 'capture effect' is a unique and highly beneficial characteristic of FM (Frequency Modulation) receivers. When two FM signals are on or near the exact same frequency, the receiver's demodulator will 'capture' and cleanly output only the stronger of the two signals, while completely suppressing the weaker one. This is vastly different from AM (Amplitude Modulation) or SSB (Single Sideband). In AM or SSB, multiple signals on the same frequency will mix together, resulting in a confusing jumble of audio or a loud heterodyne squeal. Because this phenomenon is a defined technical term in radio engineering, generic-sounding distractors like 'Interference effect' or 'Overpower effect' are incorrect, even though they might sound logically descriptive to a beginner.