Ava is at a party, deep in conversation with her friends. suddenly, she hears her name mentioned in another conversation and her attention turns to monitor that conversation. clearly, ava had been unconsciously monitoring the other conversations. such experiences demonstrate the

Such experiences demonstrate the cocktail party effect. This phenomenon occurs when in a place with many voices, as in a party, we can concentrate on a single conversation, but also when listening to a keyword from another place in the room, like our name, we can focus on this new stimulus.

I hope my answer can help you.