By Mark D. Fairchild
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Extra info for Color Appearance Models, 2nd edition (The Wiley-IS&T Series in Imaging Science and Technology)
Weber’s result is quite intuitive. For example, imagine carrying a few sheets of paper and then adding a 20-page document to the load. Clearly the difference between the two weights would be perceived.
If the initial magnitude of the stimulus (weight in this case) is denoted I, and the change required to achieve a threshold is denoted ∆I, Weber’s results can be expressed by stating that the ratio ∆I/I is constant. In fact, this general relationship holds approximately true for many perceptual stimuli and has come to be known as Weber’s law. Weber’s result is quite intuitive. For example, imagine carrying a few sheets of paper and then adding a 20-page document to the load. Clearly the difference between the two weights would be perceived.
To represent the physiological properties of these cells, the concept of receptive ﬁelds becomes useful. A receptive ﬁeld is a graphical representation of the area in the visual ﬁeld to which a given cell responds. , positive, negative, spectral bias) is typically indicated for various regions in the receptive ﬁeld. As a simple example, the receptive ﬁeld of a photoreceptor is a small circular area representing the size and location of that particular receptor’s sensitivity in the visual ﬁeld. 9 represents some prototypical receptive ﬁelds for ganglion cells.