David Hartley (philosopher) - Hartley's Theories

Hartley's Theories

The outlines of Hartley's theory are as follows. Like John Locke, he asserted that, prior to sensation, the human mind is a blank slate. By a growth from simple sensations, those states of consciousness which appear most remote from sensation come into being. And the one law of growth of which Hartley took account was the law of contiguity, synchronous and successive. By this law he sought to explain, not only the phenomena of memory, which others had similarly explained before him, but also the phenomena of emotion, of reasoning, and of voluntary and involuntary action (see Association of Ideas). A friend, associate, and one of his chief advocates, was Joseph Priestley (1733–1804), the discoverer of oxygen. Priestley was one of the foremost scientists of his age.