Cocktail Party Effect
Cocktail Party Problem · Selective Hearing
The phenomenon of the brain's ability to focus one's auditory attention on a particular stimulus while filtering out a range of other stimuli, as when a partygoer can focus on a single conversation in a noisy room.
Origin
British cognitive scientist Colin Cherry, a professor of telecommunication at Imperial College London, identified the effect in his 1953 paper "Some Experiments on the Recognition of Speech, with One and with Two Ears" in the Journal of the Acoustical Society of America. Using dichotic listening experiments, Cherry found that listeners could track one message while ignoring another, detecting physical characteristics of the unattended channel but not its content. His work directly inspired Donald Broadbent's filter model of attention (1958) and Anne Treisman's attenuation model (1964).
Everyday Use
You're deep in conversation at a noisy restaurant when someone across the room says your name — and suddenly your attention snaps over. Your brain was filtering out all that background noise, but it was still monitoring for personally relevant signals. It's why you can follow one voice in a crowd, and why hearing your name in an unattended conversation feels almost magical.