Dr. sanchez is at a faculty party and is attentively listening to dr. chen talk about her latest research on facial recognition when dr. sanchez suddenly becomes aware of someone else mentioning his name on the other side of the room. this phenomenon is known as

This phenomenon is known as the COCKTAIL PARTY EFFECT.
The cocktail party effect refers to one's capability of been able to focus one's auditory attention on a particular stimulus while filtering out a range of other surrounding stimuli. 

France played a key role in the american revolutionary war (american war of independence; 1775–1783). motivated by the ideals of the new nation which were inspired by the french enlightenment, as well as its long-term rivalry with britain and so as to avenge their territorial losses during the french and indian war, france secretly began sending supplies to the americans in 1775.