Also, a dragon's hearing is roughly on par with human hearing, although a dragon's mind can filter what noise it hears. They are capable of "blindsense", the sense in which eyes, ears, and other senses are used to detect invisible persons or objects. Dragon taste is also refined, although they do not respond well to sweet flavors, and most dragons do not discuss the matter as to why. Of all its senses, a dragon's sense of touch is the only one to decrease throughout age, thanks mostly to the development of thick, hard scales.