In the latter half of the 19th century, Ernst Heinrich Weber did a series of experiments attempting to discover the threshold of sensory awareness. He used objects of similar size and texture, but different weight. His subjects were blindfolded, then held one object in their hand for a minute. They then discarded the first object, held a second for a while and tried to decide which was heavier. Weber found that the heavier the objects, the greater the difference between the two weights had to be before the subjects could tell the difference. In other words, perhaps they could detect a difference of one ounce if the objects weighed about a pound. That same one ounce difference would be undetectable if the objects weighted closer to five pounds. \r\nWeber didn't really appreciate what a great discovery he had made. A multi-faceted physicist/experimental psychologist named Gustav Fechner did. He codified it and generalized it into what he termed 'Weber's Law': sensation varies with the natural logarithm of the stimulus. Fechner was excited because sensation was a purely mental process, while the stimulus was purely physical. Thus Weber's Law offered an example of scientific law which bridged the mind/body separation.

• experiments
• senses
• awareness
• weber"s law
• stimulus
• body vs. mind
• law
• body
• other
• separation