Improving SIRI's voice recognition

Is there a way to achieve an improvement in SIRI's voice recognition?. I love the Mac and I love the OS but have been having problems with Siri – For example it almost invariably hears SIRI as 'serious' - which should probably be amusing but becomes tiring.

Is there a learning process I could put the applicationI through?

How do I make sure that SIRI learns from the corrections I make?

It doesn't seem to be adapting to my voice and it doesn't seem as accurate as it did before on an iPad I used to have...