Answer:
arousal; are unfamiliar with
Explanation:
In Social facilitation , arousal is not referring to 'sexual arousal'. It refers to mental stimulation.
According to his theory, whenever we are in the presence of other people who review our performance, we will perform better when we are doing well-rehearsed task due to the increase in adrenaline and concentration , But will do worse when we are doing unfamiliar tasks.
So, if we put that in video game context, we tend to perform better in front of audience if we've had a lot of experience in playing that video game before.