Stone Age art expert Genevieve von Petzinger visited caves across Europe
Drawings were deemed to be the first indications of intelligence in humans but, until now, they were not regarded to have correlation to each other
Petzinger found 32 types of shape in all the European caves she visited
It suggests Stone Age humans used a written language or alphabet of sorts
Caveman drawings, originally dismissed as simple doodles, could in fact explain the origins of modern writing and the European alphabet, according to scientists.
Canadian Stone Age art expert Genevieve von Petzinger, visited caves across Europe to compile a database of the symbols scrawled on cave walls up to 25,000 years ago.
At a recent talk about her discovery Ms Petzinger said: "If these were random doodles or decorations we would expect more variation, but instead we find the same signs repeating.