Bonds and how they influence Forex.

I have a vague undertanding of Bonds. I know their yields are a good indicator of investor sentiment and as a result are a powerful tool of reference for traders. However I remain hazy in my understanding of what influences Bond prices and yields, and in turn how differences in Bond prices and yields affect forex; are there any experienced traders that can give a good explanation?

Am I right in saying that yields drop when risk aversion is high, putting safer Treasuries in higher demand and vice versa?

Any help would be greatly appreciated.

This thread has been moved to the forex discussion section, if you could post there it would be much appreciated. Thanks!