Please find below the link that provides a detailed mention of this..

https://www.sciencedirect.com/science/article/pii/S002210311500027X

To cut the long story short , this phenomenon makes a mention of the fact that when a person is made to realize about hos mortality he behaves in a more generous focusing on the bigger picture rather than thinking of the short term.

Steve Jobs makes a mention to the same effect during his Stanford commencement speech in 2005. When he was made to realize his death was near he was better able to realize the goal in his life..