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By MacDougall B. (ed.)

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In many cases it is not necessary to make a formal statement of the complete analysis. A decision may be reached as to the most important appearance aspects for a particular product in a particular situation, and other attributes may be eliminated from further consideration. However, this attribute elimination ought to be made positively on an understanding of the appearance science of the product, not by neglect. Use of basic perception sensory descriptors and scales is straightforward only when discussion, agreement, training, practice, and continuing retraining are conscientiously undertaken.

6 17 The mechanics of vision The retina acts as a transducer between light entering the eye and the processes of light and colour perception taking place in the visual cortex of the brain. The light-detecting elements of the retina are the morphologically distinct 120 million rods and 7 million cones. Approximately 1 million ganglion cells carry information from the retina to the optic nerve. At the fovea, the convergence is 1:1 while at the periphery it is several hundred to one. This degree of convergence determines spatial resolution and sensitivity.

Light adaptation occurs where the visual system attempts to compensate for changes in the level of illumination and colour constancy is experienced where the colour of an object tends to remain constant although the level and colour of the illumination are changed (Berns 2000). 1 on fresh meat, where the degree of red enhancement of lamp spectra is shown to affect the perception of product attractiveness. Models of cone adaptation response have been used to predict the consequences of changing lamp spectra on object appearance (Bartleson 1979b; Nayatani et al.

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