Hypotheses for the Redefinition of Intelligence

I. Abstract The traditional construct of intelligence centers on the Intelligence Quotient (IQ), formally introduced in 1912 by the German psychologist William Stern (1871–1938) in Die psychologischen Methoden der Intelligenzprüfung. Stern coined the German term Intelligenz-Quotient (IQ) and proposed the ratio formula “mental age ÷ chronological age × 100.” The first scientific scale for assessing children’s “intellectual level,” the Binet–Simon Scale, was published in 1905 by Alfred Binet and Théodore Simon. Although IQ tests have a long history and operational utility, they now impose severe selection pressures on contemporary educational systems. Drawing on Howard Gardner’s Theory of Multiple Intelligences and the pluralistic–successful-intelligence perspective (Sternberg, 1997; Gardner, 1983), the present paper advances a non-essentialist conjecture: IQ is not the ultimate ceiling of cognitive potential, but rather an index of how quickly and how far an individual’s brain has been developed up to the time of testing. We further integrate Hidi & Renninger’s four-phase model of interest development (triggered situational → maintained → emerging individual → well-developed individual interest) and propose the Ruohuo Interest-Equivalence Effect (RIEE-effect): provided that a person engages in high-intensity deliberate practice within a clearly defined domain, maintains exemplary work habits and scholarly integrity, and remains open to criticism, her or his ultimate attainment can approximate—or even match—the expert-level or transformative-creative performance of high-IQ peers. Keywords: IQ, multiple intelligences, non-essentialist view of intelligence, four-phase model of interest, Ruohuo Interest-Equivalence Effect, deliberate practice II. Introduction: The Uncertainty of IQ Theory Despite widespread twentieth-century use of IQ tests for educational tracking, personnel selection, and clinical diagnosis, their validity has been repeatedly challenged. Bradley & Corwyn’s (2002) longitudinal study found that emotional support significantly predicted later IQ; even among monozygotic twins, rearing differences accounted for 4–6 IQ points. Hackman et al. (2010) showed, via fMRI and cognitive tasks, that early stimulation buffers the negative cognitive effects of poverty, indicating that IQ fluctuates with environmental input. Gardner (1983) proposed at least eight independent intelligences rather than the single “logico-linguistic” skill captured by conventional tests. A meta-analysis of 85 longitudinal studies (Strenze, 2007) revealed that IQ correlates only r = .37 with adult income (.21 after controlling for schooling). Kaufman & Plucker (2011) reported correlations < .20 between IQ and creative achievements such as patents, artistic innovations, or scientific citations. Rumor has it that Richard Feynman’s high-school IQ was merely 120–125, yet he won the Nobel Prize in Physics. Terman, Cox, and Simonton repeatedly found that once IQ exceeds 160, its correlation with historic-level contributions plateaus or even declines slightly. We therefore advance the IQ-as-accelerator hypothesis: IQ reflects general cognitive ability (g) that accelerates initial learning, not an immutable ceiling. Over time, interest-driven sustained investment may offset this head start. III. Main Text 3.1 Deepening the Discussion on Interest Self-Determination Theory (SDT; Deci & Ryan, 1980) posits that environments satisfying autonomy, competence, and relatedness foster autonomous motivation, yielding enduring interest and perpetual momentum. 3.2 Prior Empirical Support A 2.5-year cluster-RCT conducted by the University of Amsterdam and Harvard University (2013) recruited 147 Dutch primary-school children (ages 7–10). After excluding left-handers, children with neurological or hearing impairments, and those already taking private music/art lessons, participants were classified into low-IQ (≤ 95) and average-IQ (96–120) groups. They were randomly assigned to music training (keyboard + rhythm, 2 × 45 min/week plus 30 min listening), visual-arts training (drawing + crafts, 2 × 45 min/week plus 30 min art history), or a control group (standard curriculum). Only the music group showed a significant Verbal IQ gain (M = 89.3 → 97.8, Δ = +8.5, p < .01, d = 0.72). The findings tentatively suggest that below-average-IQ children who develop strong domain-specific interest can catch up with or even surpass higher-IQ peers. 3.3 Planned Experiments Experiment 1: IQ-Accelerator Hypothesis Design: 3 × 2 × 4 mixed factorial Between-subjects: IQ tier (high ≥ 130, mid 90–110, low ≤ 80) Within-subjects: training week (baseline, weeks 1, 4, 8) Dependent variables: accuracy and RT on a novel rule-induction task with high learnability Prediction: High-IQ participants outperform the other two groups at baseline and week 1 (p < .01, η²p > .30), but group differences vanish by week 8 (Bayes BF₀₁ > 3), supporting the accelerator hypothesis. Experiment 2: Interest-Equivalence Compensation Design: randomized controlled non-inferiority trial Sample: N = 120 adults (18–35 y) with no formal drawing training Groups: - High-interest (n = 60): interest phase ≥ 3, self-rated interest ≥ 6/7 - High-gifted (n = 60): visuospatial IQ ≥ 130, interest ≤ 4/7 Intervention: 20 h/week structured drawing training with anonymous expert double-blind feedback Assessment: pre/post still-life drawings rated by seven blind experts (Cronbach’s α ≥ .85) Statistics: 2 × 2 mixed ANOVA, non-inferiority margin δ = 0.3 SD; BF₀₁ > 3 required Prediction: Interest group gains non-inferior to gifted group (one-sided 95 % CI lower bound > –δ), supporting RIEE. 3.4 Boundary Conditions 1. Domain must afford high learnability (decomposable via deliberate practice) 2. Feedback must be immediate, anonymous, and expert 3. Time window ≥ 12 weeks to allow neuroplasticity and schema restructuring 4. Ethical norms must be internalized to prevent goal distortion or performative learning 5. Athletic or low-learnability domains await empirical scrutiny IV. Conclusion and Outlook Integrating IQ and interest theories, we propose that sustained, high-intensity deliberate practice—coupled with integrity and openness to criticism—can enable individuals to approximate or equal the expert or transformative creative performance of high-IQ peers. We call for reduced discrimination against low-IQ individuals, the abolition of IQ-based tracking, and educational systems that cultivate interest and perseverance. The Ruohuo Interest-Equivalence Effect remains conjectural; its conceptual boundaries, instruments, and causal chain may contain flaws. We therefore invite scholars, students, and practitioners to critique, replicate, refute, or extend our work. All failures will be celebrated equally on our open-science page (OSF). If RIEE-effect is falsified, we will gladly attend its funeral—science advances by error correction, and we grow by being corrected.