Answer:
cocktail party effect.
Explanation:
According to my research on studies conducted by various psychologists, I can say that based on the information provided within the question this ability is an example of the cocktail party effect. This is a known phenomenon in which the brain has the ability to focus one's auditory attention on a particular stimulus while filtering out a range of other stimuli. Which in this case the particular stimulus is the individuals name while the other stimuli is all the other party distractions.
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