... into how the brain really works can be formed. The relationship between physical energy and subjective experience is not one-to-one, but one-to-many. As a result different questions have been addressed in order to study the multiple outcomes. Researchers have studied what stimuli organisms are able to detect, this is called detection. Which stimuli an organism is able to distinguish from another and which are indistinguishable, this is termed discrimination. Thirdly researchers have studied intensity for example how loud a sound is or how bright a light is, which is termed scaling. Finally the recognition of the stimuli has been investigated, to determine what external stimuli create the perception of an internal image and what defines that image. There has been much research devoted to the development of each of these areas by psychologists. Many psychophysicists have been interested in measuring the smallest value of some stimuli. This is called the absolute threshold. ...

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