See also: Rational thinking and Analytical writing
Statistically, how much will improving one’s writing ability improve one's thinking ability?, AI: "Improving from a B-level to an A-level in college writing could statistically improve thinking ability (specifically critical thinking skills like reasoning and analysis) by approximately 15-25%, based on educational research and effect sizes from writing interventions. This assumes deliberate practice, feedback, and focus on analytical writing."
Statistically, how much will improving one’s writing ability improve and verbal/speaking ability improve one's thinking ability?, AI: "Overall, both skills contribute to thinking ability gains, with writing yielding moderate percentile boosts in critical thinking (5-10%) and speaking/L2 proficiency offering long-term cognitive protection (e.g., dementia delay) and executive function enhancements, though exact "how much" depends on intervention intensity, age, and measurement."
"Statistically, how much will improving one’s writing ability improve and verbal/speaking ability improve one's thinking ability if one move's from a B grade college grade level of writing/speaking to an A grade level of writing and speaking?": "For adults or college students, postsecondary verbal-focused education has shown IQ gains of 5-10 points in verbal and performance domains, though effects vary by baseline ability. Overall, this could yield a 5-15% improvement in cognitive metrics like working memory or problem-solving, assuming intensive practice, as B-level speaking (functional but hesitant) advances to A-level fluency"
Grammar and IQ test scores:
What is the probability that developing your knowledge of grammar to a high level increase your IQ score on a IQ test? If it does raise it, estimate how much the rise would be?, 60-70% chance, "If it does raise the score, the estimated increase is modest, typically 3-8 points overall, with potentially larger gains (up to 5-10 points) in verbal IQ subscores. This is based on practice and education effects observed in cognitive training studies, though exact figures for grammar alone are scarce and vary by study. Sustained effort over years (e.g., through reading or language education) yields more noticeable changes than short-term training."
Writing ability and IQ test scores:
What is the probability that developing your writing level to a high level increase your IQ score on a IQ test? If it does raise it, estimate how much the rise would be?: "I'd estimate a 60-80% probability of some measurable increase in scores, as causal links have been observed in controlled twin studies for reading (a closely related skill), but direct evidence for writing alone is more correlational than definitive. If it does raise scores, the increase is typically small and gradual, often in the range of 3-8 IQ points over time with consistent effort. This is inferred from effect sizes in literacy research."