I cannot present you with hard numbers Centaurus but that is what we are told by our training department.
I put a close mates son (50 hrs TT) in the LHS of my Bonanza the other day and took him for a fly...we spent most of the time doing steep turns, a much underated skill/scan builder, and with some instruction on scanning technique he went from +/- 500' to +/- 50' in a matter of minutes. Once I had him scanning outside-AH-outside-VSI-outside-AH-outside-VSI fast enough and making small corrections it all started to gell.
Much underated instrument is the old IVSI...even in a Boeing....but how do you put an old head on young shoulders?
Gnads...even in the Boeing I find myself, occasionally, looking 'through' the FD and flying it by basics.