Proto-Vulcan was a term in Vulcan art.
In 2366, at Captain Jean-Luc Picard's request, Lieutenant Commander Data gave the following evaluation of a painting Picard had created: "While suggesting the free treatment of form usually attributed to Fauvism, this quite inappropriately attempts to juxtapose the disparate cubistic styles of Picasso and Léger. In addition, the use of color suggests a haphazard mélange of clashing styles. Furthermore, the unsettling overtones of proto-Vulcan influences –" (TNG: "A Matter of Perspective")
Clash on the Fire Plains was an example of proto-Vulcan literature. When Tuvok was unconscious due to an attack by the mysterious Ba'neth, Neelix decided to recite the complete drama for the Vulcan, performing all twenty three parts himself. (VOY: "Riddles")