The Fearless Organization by Amy C. Edmondson - Creating Psychological Safety in the Workplace for Learning,Innovation and Safety
A culture of silence is this not only one that inhibits speaking up but one in which people fail to listen thoughtfully to those who do speak up especially when they’re bringing unpleasant news

To understand why psychological safety promotes performance, we have to step back to reconsider the nature of so much of the work in today’s organisations. With routine, predictable, modular work on the decline, more and more of the tasks that people do require judgement, coping with uncertainty suggesting new ideas, and coordinating and communicating with others. This means that voice is mission critical. And so for anything but the most independent or routine work, psychological safety is intimately tide to freeing people up to pursue excellence.