"For this reason a bow of any kind, that has been bent, does not restore itself to the same form that it had before, but leans a little to the other, in consequence of the spheres of attraction and repulsion belonging to the several particles having been altered by the change of their situation. Something similar to this may take place with respect to the brain."
— Priestley, Joseph (1733-1804)
See Hartley’s Theory of the Human Mind, on the Principle of the Association of Ideas; With Essays Relating to the Subject of It. By Joseph Priestley, LL. D. F. R. S. (London: Printed for J. Johnson, No. 72, St. Paul’s Church-Yard, 1775). <Link to ESTC>