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Neurons in the visual cortex typically respond selectively to the orientation, and velocity and direction of movement, of moving-bar stimuli. These responses are generally thought to provide information about the orientation and position of lines and edges in the visual field. Some cells are also endstopped, that is selective for bars of specific lengths.(More)
The problem of detecting curves in visual images arises in both computer vision and biological visual systems. Our approach integrates constraints from these two sources and suggests that there are two different stages to curve detection, the first resulting in a local description , and the second in a global one. Each stage involves a different style of(More)
Hypercomplex or endstopped visual cortical neurons are usually supposed to be concerned with length or end point analysis. However, recent evidence demonstrates that endstopped neurons are curvature-selective, a connection that we explore here in some detail. A model of endstopped simple cells is developed and a variety of computational simulations examine(More)
Recently, there has been much debate about what kinds of genetic markers should be implemented as new core loci that constitute national DNA databases. The choices lie between conventional STRs, ranging in size from 100 to 450 bp; mini-STRs, with amplicon sizes less than 200 bp; and single nucleotide polymorphisms (SNPs). There is general agreement by the(More)
A single nucleotide polymorphism (SNP) multiplex has been developed to analyse highly degraded and low copy number (LCN) DNA template, i.e. <100 pg, for scenarios including mass disaster identification. The multiplex consists of 20 autosomal non-coding loci plus Amelogenin for sex determination, amplified in a single tube PCR reaction and visualised on the(More)
The influence of lead on iron absorption was investigated at various stages of development in rat pups exposed to lead first through mothers' milk and later in their solid diet. Hematocrit, hemoglobin, iron absorption, and tissue iron concentration were measured on d 14, 20, 23, 29, 35, 42, and 63 after birth. Both hematocrit and hemoglobin in the(More)
Acknowledgements A very significant part of my scientific education at Caltech was the result of discussions with graduate students and postdocs from various research groups, including the Hopfield group, the Allman lab, the Konishi lab and the Bower lab. While by no means an exhaustive list, I would especially like to thank the following people (in(More)