Weber's Law and Visual Perception

Topics: Perception, Gestalt psychology, Psychology Pages: 3 (944 words) Published: February 17, 2013
'sDela Cruz, Margarita Franchesca M.BSIOP 3-1
Experiment no. 2
Title: The Relationship of Weber’s law to Visual Perception Abstract:
Visual perception is one of our senses, having the ability to interpret information from our environment with the help of visible light. It allows us to judge relative position of targets or stimuli with accuracy. Judgment of size according to Weber’s law says that smaller length calls for a smaller difference. The researcher asked the subject to assume a midpoint on 30 lines comprised of ten 2 inch lines, ten 4 inch line and ten 6 inch line. Then the researcher computed each mean error. The results support Weber’s law on judgment size. 2 inch lines have lesser mean error that 6 inch line. 4 inch line has greater mean error than 2 inch line. Concluding from these results, there is a relationship between the Weber’s law and visual perception of the subject. Introduction:

Perception is the identification, organization and interpretation of the information our senses gathered from the environment. Weber’s law or Weber – Fechner law states that the change in a stimulus that will be just noticeable is a constant ratio of the original stimulus. In other words, it says that the size of the just noticeable difference (difference threshold) is a constant proportion of the stimulus value. The aim of this experiment is to determine if the Weber’s law has any relationship to Visual perception. It was stated that a just noticeable change in the stimuli will be perceived by the subject as still the original stimuli. Meaning to say, that if there is only a slight difference on the stimuli, the result is little or no error. . Psychologist Richard Gregory argued that perception is a process that undergoes a top down processing. Perception is a process that involves making inferences about what we see and try to make a best guess. When the subject looked at the lines, he developed a perceptual hypothesis or guess on what is the...

References: Levi, Dennis M., Klein, Stanley A., and Yap, Yen Lee. (1987). “Weber’s law” for position: Unconfounding The Role of Separation and Eccebtricity. Vol 28, No. 5, pp. 597 – 603. Great Britain.
Smeets, Jeroen B.J., and Brenner, Eli. Grasping Weber’s law.
McLeod, Sam. (2007). Visual Perception Theory.
Vasquez-Espinosa, R.E., and Conners, Richard W. (1982). The Law of Comparative Judgement: Theory and Implementation
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