The real interesting measure of perception/influence of music on thought might require use of functional MRI scanning, which can show the actual electrical activity in the brain.

Coming back to Bach: If he was not interested in tunings he would not have written the Well Tempered clavier.

If he was interested in promoting equal temperament he would have called it the Equal tempered Clavier

There were plenty of tunings in Bach's day. If music over the centuries had NOT settled on a standard tuning that essentially displaced the others, would modern music have been experimenting with alternative tunings?