Bouchard, G.

The g-VPR model is a model of human intelligence published in 2005 by psychology professors Wendy Johnson and Thomas J. Bouchard Jr. (Johnson & Bouchard, 2005) They developed the model by analyzing Gf-Gc theory, John Carroll’s Three-stratum theory and Vernon’s verbal-perceptual model. The g-VPR model is a four stratum model: First stratum: Primary traits. Second stratum: Broader than stratum I, but still narrow abilities. Third stratum: Verbal, perceptual and rotation factors. Fourth stratum: g factor.