Question about interest rate and "perceived risks"

The CFAI books say that interest rates depend on two things: 1. the risk free rate (treasury), and 2. perceived risks The book discusses the risk free rate (treasury) and discusses whether the treasury security is subject to interest rate risk, yield curve risk, credit risk, liquidity risk, event risk, volatility risk, call/prepayment risk, sovereign risk, etc… However, there is no discussion the “perceived risks.” Does anyone know what is meant by “perceived risks?” Are the interest rate risk, yield curve risk, credit risk, liquidity risk, event risk, volatility risk, call/prepayment risk, and sovereign risk, all considered the perceived risks?