40 Fabulous Afghans by Patricia Bevans by Patricia Bevans

By Patricia Bevans

В книге представлены forty моделей пледов афганов, связанных крючком. К каждой модели дано описание и схемы.

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The central regions, how­ ever, are unenhanced, and thus seem, by comparison, grayer. Perceiving lightness and darkness We have emphasized the tendency of neural units to react most vigor­ ously to spatial and temporal changes in the intensity of the light that falls on them, with much less response to sustained stimulation and to homogeneous fields of light. As we might expect, retinal cells differ from one another in these respects, but preference for transients is widespread. At first blush this seems surprising.

PERCEIVING LIGHTNESS AND DARKNESS ! 8 1 00 I " i � Q. E :J Z f b cd e a 9 A n gula r displacement d edge from center of receptive field Fig. 1-7. Facing page: Seven successive alignments of a square luminance profile (top) as it moves from left to right across an on-center, off-surround receptive field. In (a), the edge is still entirely to the left of the field, while by (c) the intense side of the edge covers part of the off-surround. In (d) the edge is centered on the field, by (e) the intense side of the edge covers mainly the on-center of the field, and by (g) the intense side 0f the edge completely covers the field.

I I 34 CHROMATIC VISION Letting '0' represent the base rate of neural activity, we may spell out this version of the neural code as follows: + M) is the achromatic signal. (L + M) > 0 codes whiteness; (L + M) < 0 codes blackness; (L + M) 0 codes for " brain gray", as do all ' 0 ' values. (L - M) is the red-green signal. (L - M) > 0 codes redness; (L - M) < 0 codes greenness . ( L + M ) - S is the yellow-blue signal. (L + M) - S > 0 codes yellowness; (L + M) - S < 0 codes blueness . (L = Saturation at a wavelength is coded by the ratio of the response for both chromatic channels at that wavelength to the sum of chromatic and whiteness response at that wavelength.

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