Define Psychophysics and Summarize the Contributions of Fechner and Weber

1312 Words Aug 30th, 2012 6 Pages
Define psychophysics and summarize the contributions of Fechner and Weber.

Psychophysics is the study of the relationship between physical stimuli and the behavior or mental experiences the stimuli evoke. Gustav Fechner was the most significant figure in history of psychophysics. He provided a set of procedures to relate the intensity of a physical stimulus (measured in physical units) to the magnitude of the sensory experience ( measured in psychological units). It has been determined that there are different thresholds. Absolute threshold is the smallest detectable level of stimulus. I can speak personally on this topic because I have taken many hearing tests, which is absolute threshold test. An issue that occurs is that at these
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The visual system consists of the eye, the optic nerve, and the brain. First let’s explain the eye, the eye has an outer clear “shell” known as the cornea. This transparent shell covers the pupil and the iris and is were light enters the eye. The iris is the colored area in the eye and helps control the size of the pupil by allowing more or less light in depending on the surroundings. The tiny opening in the center of the iris is called the pupil. The pupil allows light to enter the retina. It is black in color due to the absorption of light by the tissue in the eye. Connecting the eye to the brain is the optic nerve, also called cranial nerve 2. The optic nerve leads to the lateral geniculate nucleus. So how do we process images? Its all pretty simple. When light hits and object, it reflects off that object and hits our eye. Light then enters our eye through the cornea, which then passes through the black circle in our eye called the pupil. Once the iris has controlled the light through the size of the pupil, the light enters the lens of the eye. Lining the inside of the eye is the retina, which is composed of hundreds of millions of light sensitive cells that meet up at the back of the eye and form the optic nerve. Interesting enough, the eye itself perceives the image upside down; it’s the brain that turns it right side up. Each eye sees the image differently and our brain combines the images. Sensory information ultimately arrives at the visual

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