Are the two USB3 ports on a Mac Book Pro independent channels of USB?

Are the two USB3 ports on a 15" 2012 Mac Book Pro independent channels of USB? If I plug a USB2 device into one of the ports, does it slow the other as well?
Thanks
MtD

Thanks - according to this Apple KB article:
http://support.apple.com/kb/ht5172
plugging in a USB 2 device into the USB3 daisy chain slows all devices on that chain to USB2 speed.
What I am trying to find out is if the two ports on the side of the MacBook Pro are independent channels of USB, so that you could operate with a USB2 device on one port and still obtain USB 3 speeds (with USB3 only devices plugged in) on the second port.
MtD
Message was edited by: Meg The Dog to fix typo

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