منابع مشابه
Analog VLSI Circuits for Primitive Sensory Attention
Circuitry that performs primitive attention tasks is presented. With the addition of feedback to a winner-take-all circuit we are able to mediate the selection of a single location within a sensory array through the use of hysteresis.
متن کاملPrimitive Nervous Systems.
For nearly fifty years the dominant and accepted theory of the evolution of the nervous system has been that of G. H. Parker, developed over the course of the decade from 1909 to 1919 and summarized in his now classic book The Elementary Nervous System.' Like many successful theories, it was an oversimplification of contemporary knowledge presented in a forceful and stimulating manner. In essen...
متن کاملDorsal spinal interneurons forming a primitive, cutaneous sensory pathway.
In mammals, sensory projection pathways are provided by just three classes of spinal interneuron that develop from the roof-plate. We asked whether similar sensory projection interneurons are present primitively in a developing lower vertebrate where function can be more readily studied. Using an immobilized Xenopus tadpole spinal cord preparation, we define the properties and connections of sp...
متن کاملOn Maximal Primitive Fixing Systems
Let max (M) denote the maximal number of points forming a primitive xing system for a convex body M R n. Sharpening results of B. Bollobb as with respect to the quantity max (M) for n 3, we construct counterexamples to the conjecture max (M) 2(2 n ? 1) of L. Danzer. These counterexamples M satisfy max (M) = 1, and they can belong to the following classes of convex bodies: cap bodies, zonoids, a...
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ژورنال
عنوان ژورنال: Nature
سال: 1976
ISSN: 0028-0836,1476-4687
DOI: 10.1038/262729a0