A demonstration of two distinct geniculocortical projection patterns in albino ferrets.

The geniculocortical pathways of albino ferrets have been studied by injecting lectin bound horseradish peroxidase into the visual cortex and then studying the geniculate distribution of retrogradely labelled cells in the dorsal lateral geniculate nucleus. It has been shown that in ferrets, as in Siamese cats, there are two quite distinct patterns of geniculocortical projection. One of the patterns seen in ferrets is comparable to the 'Midwestern' pattern previously described in Siamese cats, while the other is comparable to the 'Boston' pattern.