By Karen M. Mudry, Robert Plonsey, Joseph D. Bronzino
Constructed from chapters conscientiously chosen from CRC's best-selling engineering handbooks, volumes within the ideas and functions in Engineering sequence offer handy, cost-effective references sharply eager about specific engineering subject matters and subspecialties. Culled from the Biomedical Engineering guide, Biomedical Imaging offers an summary of the most clinical imaging units and highlights rising structures. With purposes starting from imaging the full physique to replicating mobile parts, the imaging modalities mentioned comprise x-ray structures, computed tomographic platforms, magnetic resonance imaging, nuclear medication, ultrasound, MR microscopy, digital fact, and extra.
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New York, Academic Press. ). 1998. Williams Textbook of Endocrinology, Philadelphia, WB Saunders. 9th ed. 5 Definitions .......................................................................... 3-1 Functions of the Nervous System ..................................... 3-3 Representation of Information in the Nervous System ................................................................................. 3-4 Lateral Inhibition ............................................................... 3-6 Higher Functions of the Nervous System ........................
A large degree of uncertainty prevails and requires the brain to operate probabilistically. In the nervous system there exists a large amount of redundancy, although neurons might have different thresholds. It is questionable, however, if these units are entirely equivalent, although they share parts of their receptive fields. The nonoverlapping parts might be of importance and critical to sensory function. On the other hand, redundancy does not necessarily mean unspecified or random connectivity.
Integration of large numbers of converging inputs to give a single output can be considered as an averaging or probabilistic operation. The “decisions” made by a unit depend on its inputs, or some intrinsic states, and reaching a certain threshold. This way every unit in the nervous system can make a decision when it changes from one state to a different one. A theoretical possibility also exists that a mass of randomly connected neurons may constitute a trigger unit and that activity with a sharp threshold can spread through such a mass redundancy.