This nice policy analyzer from John Kicklighter of Dailyfx Research explains a lot to understand, which policy adaptation might lead to which outcome. From the "Neutral" point as move more towards left the policy becomes more dovish and financial market reactions become more extreme. And on the right, we have the hawkish ones.

Today's BoJ action was somewhere between dovish guidance and rate cut, while the market was expecting just short of "Helicopter Money". Hence, the reaction on the yen, which is currently at 102.8 per dollar.