Multiple Intelligences Theory: What Gardner Said vs. What Science Shows

Ask almost any teacher about intelligence and they'll mention Howard Gardner's theory of multiple intelligences. Ask most cognitive psychologists the same question and you'll get a very different reaction. Gardner's 1983 framework has been enormously influential in education, wildly popular in popular culture, and deeply controversial in academic psychology. Understanding it clearly — what it actually claims, what the evidence shows, and where it intersects with IQ — is valuable for anyone thinking seriously about intelligence.

What Howard Gardner Actually Proposed

In his 1983 book Frames of Mind, Howard Gardner, a Harvard developmental psychologist, argued that the traditional concept of IQ — based on a single general cognitive factor — was too narrow. He proposed that humans have not one intelligence but multiple distinct intelligences, each representing a different way of processing information.

Gardner's original criteria for calling something an "intelligence" included:

• Potential isolation by brain damage (a specific region of the brain dedicated to it)
• Existence of savants or prodigies in the ability
• Identifiable core operations or processing
• A developmental history and set of expert "end-state" performances
• An evolutionary history and plausibility
• Support from experimental psychology tasks
• Support from psychometric findings
• Susceptibility to encoding in a symbol system (language, numbers, maps, etc.)

The 8 (and Possibly 9) Intelligences

Gardner identified the following distinct intelligences:

Gardner later proposed a possible ninth intelligence — Existential intelligence— the capacity to grapple with philosophical questions about existence, meaning, and death. He remained uncertain whether it met his criteria.

The Core Challenge to IQ: The "Positive Manifold"

Gardner's theory directly challenges the traditional IQ framework. Standard IQ testing rests on the empirical observation that virtually all cognitive abilities are positively correlated with each other — a phenomenon called the "positive manifold."

If you score high on verbal tests, you tend to score high on spatial tests, on mathematical tests, and on reasoning tests. This consistent positive correlation across all cognitive abilities is one of the most replicated findings in psychometrics. It's the empirical foundation for the concept of "g" — a general intelligence factor that underlies all cognitive performance.

Gardner's theory requires that the different intelligences be largely independent — that high musical intelligence doesn't necessarily predict high logical-mathematical intelligence, for example. But psychometric research consistently finds substantial positive correlations between Gardner's intelligences when measured objectively. This is a major empirical challenge to the theory.

Scientific Criticism of Multiple Intelligences

Gardner's theory has attracted substantial criticism from cognitive scientists and psychometrists:

• Missing empirical tests. Gardner developed his theory primarily through logical analysis and case studies, not through the empirical tests (factor analysis of cognitive test batteries) that psychometricians use to identify distinct cognitive abilities. When researchers have tried to test the theory psychometrically, they typically find the positive manifold, not independent intelligences.
• "Intelligences" look like talents or personality traits. Many critics argue that what Gardner calls intelligences are better understood as talents (musical ability), personality traits (interpersonal sensitivity), or domain expertise (naturalistic knowledge) rather than distinct cognitive processing systems.
• The learning styles problem. Gardner's theory has been widely conflated in education with "learning styles" theory (visual learners, auditory learners, etc.), which has been extensively tested and not validated. Teaching to different "learning styles" hasn't been shown to improve learning outcomes.
• Lack of independent measurement. There are no validated psychometric batteries that reliably and independently measure Gardner's intelligences. Without measurement tools, the theory can't be scientifically tested or applied.

Prominent cognitive scientist Steven Pinker wrote that Gardner's intelligences are "picked out by criteria from folk taxonomy, not from the rigorous analysis of cognition." Educational psychologist John White has argued the theory lacks the empirical foundations to be considered scientific.

What Gardner's Theory Gets Right

Despite its empirical limitations, Gardner's theory captures important truths:

• Human cognitive abilities are multidimensional. Even within the psychometric mainstream, the CHC model recognizes dozens of distinct broad and narrow cognitive abilities — not just a single number.
• Traditional IQ tests miss important capacities. Creativity, social intelligence, aesthetic sensitivity, and practical wisdom are real and important human capacities that don't appear prominently on IQ tests.
• Schools should value multiple forms of excellence. Broadening educational approaches to reach students with different strengths has genuine pedagogical value, regardless of whether the underlying theory is scientifically sound.
• Excellence takes many forms. A world-class jazz musician, a brilliant therapist, and an Olympic gymnast have all developed extraordinary capacities through years of deliberate practice — even if those capacities don't show up on an IQ test.

Where Mainstream Cognitive Science Stands

Most cognitive psychologists today accept a hierarchical model of intelligence that accommodates both general intelligence (g) and specific abilities:

• g (General Intelligence) — a broad factor underlying all cognitive performance; this is what IQ tests primarily measure
• Fluid Intelligence (Gf) and Crystallized Intelligence (Gc)— the major broad factors; see our fluid vs. crystallized guide
• Specific abilities — spatial reasoning, verbal reasoning, processing speed, working memory, etc. — which can diverge meaningfully from g

This framework acknowledges that people can have cognitive profiles (high on some abilities, lower on others) without abandoning the concept of general intelligence. It's a more empirically grounded version of the insight Gardner was reaching for.

Frequently Asked Questions

What are Howard Gardner's 8 types of intelligence?

Linguistic, Logical-Mathematical, Spatial, Musical, Bodily-Kinesthetic, Interpersonal, Intrapersonal, and Naturalistic — with a possible ninth (Existential). See our What Is IQ? guide for how mainstream psychology views intelligence.

Is the multiple intelligences theory scientifically proven?

Not well-supported empirically. When researchers test the theory using psychometric methods, they find positive correlations between all cognitive abilities (the positive manifold) — inconsistent with truly independent intelligences. The theory has more influence in education than in academic psychology. See our IQ test accuracy guide.

How does it relate to IQ?

Gardner's theory directly challenges IQ by arguing that standard tests measure only two of eight intelligences. Mainstream cognitive psychologists counter that all cognitive abilities share a common general factor (g) that IQ tests measure well. Both perspectives have captured important but partial truths.

Should schools use multiple intelligences theory?

Using varied instructional approaches has educational merit. However, assigning students to fixed "intelligence types" or designing all curriculum around a student's supposed profile isn't supported by research.

Wondering how you perform on the specific cognitive abilities that IQ tests measure? Take our free IQ test — 30 questions spanning reasoning, verbal comprehension, and spatial ability.