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1001 Math Problems by Learning Express

By Learning Express

1001 Math difficulties presents routines masking addition and subtraction via fractions, decimals, and chances, and directly to easy geometry and simple algebra.

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Extra resources for 1001 Math Problems

Example text

The sites of the corresponding receptive fields mapped at each recording site are shown in the semicircular chart. For example, in penetration I, the first receptive field (lA) was located near the center of the visual field, and the receptive fields lB, Ie, and ID marched upward in the visual field as the microelectrode was advanced through the area. The receptive fields mapped in the course of this experiment revealed a highly topographic map, illustrated at top left. This map contains an unusually large representation of the more peripheral parts of the visual field.

Images A and D show the medial wall of the right hemisphere of the brain; Band E are the same brains unfolded. In the upper left is a visual field map in which color indicates eccentricity: blue is near the center of the visual field and red is the far periphery of the visual field. The color-coding in images A and B shows the locations of the representations of these parts of the visual field. Image C shows a complete unfolding of the visual cortex with the eccentricity map superimposed. In the lower left is a visual field map in which color indicates polar angle, the angle between the center of the visual field (the fixation point) and a line extending to the periphery of the visual field.

The rate of change has been remarkably constant over the past billion years and the times of divergence derived from this measure fit remarkably well with observations based on the fossil record. Thus, for example, the ancestors of humans diverged from nonprimate mammals about 70 million years ago; and the common ancestor of mammals and insects probably existed about 600 million years ago. "Molecular clock" data such as this is extremely useful for establishing the approximate timing of events in brain evolution and has been applied to many other genetic systems.

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