I'm sure there's been studies at some point, but I really do feel like snakes are far more sensitive to changes in air pressure, outside temps, and seasonal transitions that we are. I've always backed my snakes off during the winter months, usually to a four week time table (especially when I had all BPs). I usually start around November and keep them on through March or so, depending on the weather - or, as stated previously, they start looking at my fingers as food. When they start flying out of their tubs, it's time to go back to ten days lol
I'll have to see with the boa this year. She's still really young and consistently taking small rats every ten days without missing a beat. I may just spread her out the a solid two weeks, and back the BP off to every four weeks. He's already starting to slow down and refused his meal before last.