Gustav Fechner's work in psychophysics involved exploringhow we reach absolute thresholdhow subliminal advertising affects us how external stimuli affect ushow we affect other objects

Gustav Fechner was a German philosopher and physicist who is often credited as one of the founders of psychophysics, the science that measures the quantitative relations between physical stimuli and the sensations they evoke in the human observer.

1. Exploring how we reach absolute threshold: Fechner was interested in understanding the smallest amount of stimulus intensity necessary to activate a sensory system. This is known as the absolute threshold. He conducted experiments to determine the point at which individuals could detect a stimulus, such as a light or a sound.

2. How subliminal advertising affects us: While Fechner did not specifically study subliminal advertising, his work in psychophysics laid the groundwork for understanding how stimuli below our conscious awareness (subliminal stimuli) can still affect our behavior and decision-making.

3. How external stimuli affect us: Fechner's work was largely focused on understanding how external stimuli (like light, sound, and pressure) are perceived by our sensory systems. He developed the concept of the "just noticeable difference" (JND), which is the minimum difference in stimulation that a person can detect 50% of the time.

4. How we affect other objects: This is not directly related to Fechner's work in psychophysics. His work was more focused on how we perceive and respond to external stimuli, rather than how we affect other objects.