Abstract
The precision of the projection of the visual field to the dorsal lateral geniculate nucleus (LGNd) of the cat was studied by plotting the receptive fields of single neurons recorded extra-cellularly in the nucleus. The concepts of a ‘projection column’ and of ‘random scatter in the location of receptive fields’ have been defined in relation to cells in the LGNd. A projection column contains 90% of all the cells in the LGNd that have receptive fields with a common visual direction, the central axis of the column being the projection line for the given visual direction. In the region of the LGNd devoted to central vision the columns have a circular cross section and are about 1 mm in diameter.
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