These philosophers also tended not to emphasize the distinction between reason and intellect, describing the peculiar universal or abstract definitions of human understanding as being man-made and resulting from reason itself.[81] Hume even questioned the distinctness or peculiarity of human understanding and reason, compared to other types of associative or imaginative thinking found in some other animals.[82] In modern science during this time, Newton is sometimes described as more empiricist compared to Leibniz.