Final answer:
The scenario described points to the Hidden quadrant of the Johari Window, where information is known to oneself but not to others, until it is revealed.
Step-by-step explanation:
Nobody knowing your gift for singing until you amazed them by winning first prize in your town’s annual talent contest is a situation that would be described by the Hidden quadrant of the Johari Window. The Johari Window is a psychological tool that can help people understand their relationship with themselves and others. The Hidden quadrant (also known as the 'Facade') contains things that you know about yourself but others do not. Since in this scenario others did not know about the talent until it was revealed, this information was in your Hidden quadrant before the talent show.