1. Weber's law provided "a quantitatively precise relationship" (Hunt, 2007, p. 126) between:
a. A person's emotions and speed of thinking.
b. A physical stimulus and a person's experience.
c. The strength of a person's desires and the speed of his or her actions.
2. By showing that he could measure the speed of a neural impulse, von Helmholtz:
a. Made irrelevant the idea of a vital force carrying messages through nerves at infinite speed.
b. Supported Nativist theories of mind that Kant and other German philosophers had developed.
c. Discovered something that was significant for biologists but was not relevant to the psychology of that time.