I just cant understand how these two can be separated. They are so heavily connected, the fingers will not play a single note without the brain, they will not have any technique, strength, stamina etc. The socalled "fingermemory" is based in the brain, reflexes are based in the spine. With no brain there would be no technique to talk of, so you cant say that something demands more then the other. Playing fast and accurate are the fingers and brain working together, and the reason someone plays faster then others are methods of training and choice.
Yes, the brain is involved in co-ordinating the technique, and the fingers are involved in executing the mechanique.
However, this is divided from 'brain virtuosity' because althought they work in harmony, they are entirely different processes.
Brain virtuosity is like the RAM in a computer, mech-virtuosity is like the processor.
The former stores and deals with the information, the processor brings it into physical form...
I also make this division, because some pianists are obviously better at one than the other..
Eg - those with great technical ability, but smaller repertoire...and vice versa.
Anyone who thinks modern/contemporary music is only complex in brain terms and not digitally has a very small experience of the genre..There are some phenominally difficult pieces to play in terms of finger technique and in particular chords and pianistic geography.
This is primarily brain-virtuosity relevant.
There is a new level of density in notes, , but the note distribution is laid out in such a way that it does not facilitate a smooth running of the mechanism, it involves the brain more.
Theoretically, if these passages were memorised and ingrained in the fingers, they could display technical ability in a comparable way to standard etude repertoire, but this is impractical and technical ability can be displayed much better in music with much more 'streamlined' and pianistic writing.
As I was saying before, comparing the Olympics, to an elaborate obstacle course...the Olympic style of things is much better suited to the practical evaluation and display of technical ability.
And Alistair, I'd agree, that while music of this 'new complexity' style taxes the brain virtuosity aspect in a way that can't be matched, it would be foolish to assume that it is impossible to display an incredible talent for brain virtuosity in more standard repertoire.