Louis Thurstone's factor analyses led him to the theoretical conclusion that Spearman's g-factor is

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Louis Thurstone's factor analyses led him to the theoretical conclusion that Spearman's g-factor is actually seven separate mental abilities. Thurstone's model proposed seven primary mental abilities: verbal comprehension, word fluency, number ability, spatial visualization, associative memory, perceptual speed, and reasoning. He argued that these abilities were relatively independent of each other and that no one ability was more important than others in predicting general intelligence.

Louis Thurstone's Factor Analyses Led Him to the Theoretical Conclusion