Chapter 3 Summary
1. In this chapter we followed the path of image processing from the eyeball to the brain. Neurons in the cerebral
translate the array of activity signaled by retinal ganglion cells into the beginnings of forms and patterns. The
visual cortex is organized into thousands of tiny computers, each responsible for determining the orientation, width, color, and other characteristics of the stripes in one small portion of the visual field. In Chapter 4 we will continue this story by seeing how other parts of the brain combine the outputs from these minicomputers to produce a coherent representation.
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2. Perhaps the most important feature of image processing is the remarkable transformation of information from the
receptive fields of retinal ganglion cells to the
receptive fields of the cortex.
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3. Cortical neurons are highly selective along a number of dimensions, including stimulus orientation, size, direction of motion, and eye of origin.
4. Neurons with similar preferences are often arranged in
in primary visual cortex.
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5. Selective
provides a powerful, noninvasive tool for learning about stimulus specificity in human vision.
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6. The human visual cortex contains pattern analyzers that are specific to spatial
and orientation.
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7. Normal visual development requires normal visual experience. Abnormal visual experience early in life can cause massive changes in cortical physiology that result in a devastating
loss of spatial vision.
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