sentences:  Smith in 1980.It was proposed in its modern form by Australian neuroscientist Jack Pettigrew in 1986 after he discovered that the connections between the retina and the superior colliculus (a region of the midbrain) in the megabat "Pteropus" were organized in the same way found in primates, and purportedly different from all other mammals.This was followed up by a longer study published in 1989, in which this was supported by the analysis of many other brain and body characteristics.