You need to narrow down what you're looking for,
either the size of a human brain, or a Neanderthal brain,
The Homo sapien (us) have evolved from the Homo Neanderthal to the point where we can be classified as sub species
but going on gut instinct here,
This should help you out
Neandertals 1200-1750 1450
modern Homo sapiens 900-1880 1345
http://anthro.palomar.edu/homo2/mod_homo_2.htm
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Additional
There is a school of thought that puts the Neanderthal as a sub species of the genus Pleistocene and a parallel evolution not a predecessor to homo-sapian.
They were the same size.
yes, you will have below average intelligence.
According to modern science, very similar as it has been found that the modern human that has lived among neanderthal man ie above Africa has traces of neanderthal DNA. While Africans below that area are pure humans.
It is very likely that modern humans have a great many Neanderthal genes in our common human makeup.
The first Neanderthal fossils were found in Gibraltar when tunnels were built for defence, but they were not recognised as a different human species at the time. The first fossils to be recognised as different from modern humans were found in the Neander Valley, near Dusseldorf, Germany.
Neanderthals had slightly larger brains than modern humans on average, but there were differences in the organization and structure of their brains. Neanderthals had a larger visual processing area, while modern humans have larger areas related to higher cognitive functions. Neanderthals likely had similar cognitive abilities to modern humans, but may have had differences in social behaviors and communication.
A Neanderthal's brain typically had a volume of around 1300-1750 cubic centimeters, which is roughly equivalent to 79-107 cubic inches.
The same as a modern human.
They were the same size.
The Neanderthal brain was the same size as modern human.
It was the same size.
It is true that Neanderthals had larger brains on average than modern humans. However, brain size alone does not necessarily equate to intelligence. Modern humans have developed different cognitive abilities that have enabled them to survive and thrive.
On average, Neanderthal brains were slightly larger than those of Homo sapiens. However, brain size is not the only factor determining intelligence, as the structure and organization of the brain are also important. Some studies suggest that Homo sapiens had more advanced cognitive abilities due to their brain organization.
It's the size of your fist maybe not even.
Neanderthal was an ancient human, closely related to modern humans.
The average Neanderthal brain size was about 1,600 cc, which is slightly larger than the average modern human brain size of around 1,400 cc. This suggests that Neanderthals had relatively large brains compared to their body size.
Their brain size was the same as modern humans.