01:830:301 Lecture Notes - Sclera, Choroid, Visual Acuity

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28 Jan 2014
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Sensation: the ability to detect a stimulus and, perhaps, to turn that detection into a private experience: the ability to detect the pressure of a finger. Perception: the act of giving meaning to a detected sensation. How you understand the finger that runs down your back. Thresholds: the range of senses you can handle. Psychophysics: defines the quantitative relationships between physical and psychological (subjective) events. The difference required for detecting a change in weights: weber"s law jnds change systematically in a specific ratio. Size of difference is a constant proportion of the stimulus intensity. The principle describing the relationship between stimulus and resulting sensation that says the just noticeable difference (jnd) is a constant fraction of the comparison stimulus. We know how much we varied the stimulus, and either the observers can tell that the stimulus changed or they cannot.

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