HEARING (AUDITION)

Despite the claim that 90 per cent of our information input is visual, hearing is a close second to vision in terms of knowledge...

HEARING

Theories of hearing must explain both the wide range of pitch—from 20 to 20,000 cycles per second—and the full range of intensity or loudness...

HELMHOLTZ, HERMANN LUDWIG FERDINAND VON (1821-94)

This remarkably versatile scientist, who made many pioneering contributions to physiological psychology, was bom in Potsdam, Germany, and was educated at the Friedrich-Wilhelm Institute...

HEPATOLENTICULAR DEGENERATION

A rare disorder involving severe damage to the brain and liver due to a deficiency of copper metabolism. It is one of the causes...

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