Showing papers on "Orientation column published in 2019"
TL;DR: Using a novel, highly accurate method of targeting electrode position, the presence of three subdomains within single orientation domains is reported for the first time and it is suggested that these zones subserve computation of distinct aspects of visual contours.
Abstract: In the mammalian visual system, early stages of visual form processing begin with orientation-selective neurons in primary visual cortex (V1). In many species (including humans, monkeys, tree shrews, cats, and ferrets), these neurons are organized in a beautifully arrayed pinwheel-like orientation columns, which shift in orientation preference across V1. However, to date, the relationship of orientation architecture to the encoding of multiple elemental aspects of visual contours is still unknown. Here, using a novel, highly accurate method of targeting electrode position, we report for the first time the presence of three subdomains within single orientation domains. We suggest that these zones subserve computation of distinct aspects of visual contours and propose a novel tripartite pinwheel-centered view of an orientation hypercolumn.
17 citations
TL;DR: Results showed a 3-5-fold decrement in optical signal from orientation columns and a drastic decline in contrast sensitivity, which suggest the modification of cortical columnar functioning under artificially correlated synchronization of retinal input.
Abstract: The present study used optical imaging to investigate the development of the optical signal within orientational columns in primary visual cortex of cats reared under conditions of rhythmic light stimulation. Results showed that, although inter-columnar spacing was unchanged, a 3-5-fold decrement in optical signal from orientation columns and a drastic decline in contrast sensitivity was observed in both areas 18 and 17. These data suggest the modification of cortical columnar functioning under artificially correlated synchronization of retinal input.
3 citations