David's comment: This study clearly shows that both electrical signals and dopamine molecules work in a coordinated fashion as we shift tasks. The brain works for us. > > dhw: And yet when scientists identify the coordinated electrical and chemical processes that accompany cellular behaviour, you insist that these drive the cell, as opposed to the cell driving the processes. I know, I know, your dogma is unshakable. -Dopamine is made by brain cells; axons in developing networks are guided by instructions in cells. The cells are intimately involved in these processes with the instructions contained in the cells. your cart is before your horse.