What is the 'cocktail party effect'?

Answer

Your brain filters out background sound, and you can still notice your own name from across the room.

Context

The term was coined in the early 1950s by the British scientist Colin Cherry, who studied how people follow one speaker among several. In his dichotic listening experiments, participants wore headphones with a different message in each ear and repeated back the one they were told to attend to. They could do this well, but afterward they noticed little about the ignored message beyond basic features like whether the voice was male or female, and generally not what language it was in or its content.

The name effect adds a twist. Later work by Neville Moray reported that a notable share of participants noticed their own name in the unattended ear. A 2022 preregistered replication found evidence that a person's own name does capture attention, though only a minority of people notice it, so the common claim that everyone hears their name is overstated. Researchers explain this with models in which unattended speech is partly processed, so that highly meaningful items can break through.

Neuroscience studies show the brain does not simply mute the ignored voice. Recordings of brain activity find that neural signals follow the rhythm of the attended speech more strongly than that of competing speakers. Spatial cues, differences in pitch and voice, and lip reading help with the separation. The ability declines for some people with hearing loss, which makes noisy rooms especially difficult.