That's an original Motif 8 (not ES, XS, or XF)? You have installed the latest Yamaha USB drivers?
Make sure you have the Motif MIDI IN/OUT mode set to USB: UTILITY -> MIDI -> OTHER -> MIDI IN/OUT
Connect the Motif to the MacBook with a USB cable, then the Motif should be visible in the MIDI in/out preferences of both Reason and Logic. You should see multiple ports for the Motif...the Motif keyboard and sound engine are on port 1. Select that and you should be able to play software instruments in both Logic and Reason.
Once you have that working, come back and I can help you set up the Motif's Remote mode to control Logic and Reason.
I listened to Hatfield and the North at Rainbow. They were very wonderful and they made my heart a prisoner.