Name: how brain growth shapes intelligence
Uploaded: 2025-01-08T16:31:10.000Z
Duration: 1 min 30 s
Channel: JoVE

Biological factors like the size of the brain and the specific brain regions, along with genetics, influence intelligence.
Intellectual abilities, like verbal skills, modestly correlate with brain size, while the correlation is weaker for abilities such as spatial reasoning.
Despite Einstein&#39;s brain being smaller than average, his parietal cortex was 15% wider, contributing to his exceptional visual imagery capacity. The higher density of neurons and glial cells likely increased neural processing efficiency, potentially compensating for his smaller brain size.
Specific brain regions, such as the prefrontal cortex, regulate planning, impulse control, and short-term memory, forming dense neural connections with other brain regions.
This suggests that the prefrontal cortex functions as a &#34;command center,&#34; integrating information to support complex thinking.
Additionally, genetics influences intelligence, with over 1,000 genes contributing minor effects.
Genetic variants, known as alleles, predict educational attainment and contribute to cognitive development across the lifespan.
Hereditary studies measure the intelligence variation in a group due to genetic differences and suggest tha

biological influences on intelligence

Biological Influences on Intelligence

Intelligence is often thought to be linked to brain size, but the relationship is more complex than that. While brain size does correlate modestly with some abilities, like verbal skills, the connection is weaker for others, such as spatial reasoning. Other factors, like brain structure, also play crucial roles. For instance, despite Einstein&#39;s smaller-than-average brain, his parietal cortex, which is involved in spatial reasoning, was 15% wider, suggesting that neural density might matter more than size alone.
The research highlights developmental differences in the prefrontal cortex (PFC) across children with varying IQ levels. The PFC, responsible for higher-order functions like planning, decision-making, and emotional regulation, develops differently depending on a child&#39;s IQ. At age 7, children with superior IQs (121-145) have a thinner cortex compared to those with average (83-108) or high IQs (109-120). The cortex of superior IQ children thickens more rapidly, peaking at age 12, whereas it peaks at age 8 for children with average or high IQs. This delayed peak suggests that the PFC takes longer to mature in children with superior IQs. Researchers propose that this extended cortical thickening period in superior IQ children may indicate a prolonged critical period for developing advanced cognitive abilities.
Genetics also influences intelligence, with over 1,000 genes each contributing minor effects. Researchers have identified genetic variants, or alleles, linked to educational attainment, which can predict cognitive outcomes throughout life. Heritability studies suggest that up to 75% of intelligence variation within certain groups is genetic. However, heritability explains population trends, not individual intelligence. Environmental factors like education, nutrition, and social experiences still play crucial roles in shaping intelligence.
Supportive environments, such as good schools, proper nutrition, and enriched learning experiences, help individuals reach their full genetic potential. Even in populations with high genetic influence, improving environmental factors can significantly boost cognitive abilities, showing that intelligence results from a dynamic interaction between genes and the environment.

Biological factors like the size of the brain and the specific brain regions, along with genetics, influence intelligence.
Intellectual abilities, like ...

Education

JoVE Core

Introduction to Psychology

Unit 1

Thinking, Language And Intelligence

KEY TERMS AND CONCEPTS

how brain growth shapes intelligence

Intelligence is shaped by brain size, brain structure, genes, and environment. Brain size has a modest link to some skills, especially verbal ability, but it is a weaker predictor for spatial reasoning. This means intelligence cannot be explained by size alone.

Brain structure also matters. For example, Einstein had a smaller-than-average brain, but his parietal cortex was 15% wider. The parietal cortex helps with spatial reasoning, so this suggests that neural density may matter more than overall brain size in some cases.

Research also shows clear developmental differences in the prefrontal cortex, or PFC. The PFC supports planning, decision-making, and emotional control. At age 7, children with superior IQs have a thinner cortex than children with average or high IQs. Their cortex then thickens faster and reaches its peak at about age 12, while the peak is about age 8 for the other groups.

This later peak suggests that the PFC matures more slowly in children with superior IQs. Researchers think this longer period of cortical thickening may reflect a longer critical period for building advanced thinking skills. Intelligence is also influenced by genetics, with more than 1,000 genes each making small contributions. Scientists have also found alleles linked to educational attainment that can help predict cognitive outcomes over a lifetime.

Heritability studies suggest that as much as 75% of intelligence variation within certain groups is genetic. However, heritability describes patterns in populations, not the intelligence of one person. Environment still matters. Education, nutrition, social experiences, good schools, and enriched learning can all help people reach their genetic potential. Even when genetics plays a strong role, better environmental support can raise cognitive ability, showing that intelligence comes from a dynamic interaction between genes and the environment.

How Brain Growth Shapes Intelligence

introduction to cognitive psychology

Cognitive Psychology and the Computer Model

Cognitive psychology studies how people think, remember, and understand information. It looks at how thinking works with emotion, creativity, language, and problem-solving. The field focuses on how information is processed and changed during remembering, thinking, and knowing. Cognitive psychology emerged in the mid-20th century after behaviorism had dominated psychology. Behaviorism focused on observable behavior and did not study mental processes. In the 1950s, computers helped spark a new...

concepts and prototypes

How the Brain Groups Ideas

The brain groups ideas into concepts and uses prototypes to sort new information. Sensory stimuli first become neural impulses, and the brain processes them into thoughts, language, and memories. Emotions and memories also shape this process, helping create a full mental picture. Concepts are mental categories that organize linguistic data, images, ideas, and memories. They keep knowledge orderly and easy to use. Concepts can be abstract, such as justice, or concrete, such as members of...

natural and artificial concepts

Concepts Built from Experience and Rules

Natural and artificial concepts help explain how people organize ideas in psychology. Natural concepts come from direct or indirect experience. They are built from what a person sees, hears, touches, or reads about over time. Snow is a clear example of a natural concept. A student in Essex Junction, Vermont may know snow from direct experience by seeing it fall, touching it, shoveling it, and playing in it. A student in Saint Vincent in the Caribbean may know snow only through indirect...

schemata

Schemata and Everyday Behavior

Schemata are mental constructs that organize related ideas and help the brain process information efficiently. When a schema is activated, it can shape the assumptions people make about people or objects. One important type is the role schema. This is the set of expectations tied to a specific role, such as a firefighter. A firefighter schema may bring to mind bravery and a focus on community, but these expectations are not always correct. Role schemata can also support biases and stereotypes...

language

Language as Human Symbol System

Language is a human communication system that uses words and rules to share information. It depends on symbols and grammar. That makes it different from communication that uses postures, movements, odors, or vocalizations. People use language to speak, write, or sign. It supports listening, reading, and writing. Language also shapes inner speech, or the silent self-talk people use in their minds. This ability helps explain why language is often seen as a key part of what makes humans unique...

components of language

Language Structure: Sounds, Words, and Meaning

Language is built from sounds, words, and rules for meaning. It can be spoken, signed, or written. The two main parts are the lexicon and grammar. The lexicon is the vocabulary of a language, and grammar is the set of rules that helps speakers use those words to communicate. Words begin with phonemes, the basic sound units of language. Different languages use different sets of phonemes, such as sounds like "ah" and "eh." Phonemes combine to form morphemes, which are the smallest units of...

language development

Stages of Language Development

Language development follows a clear sequence from early sound recognition to full sentences. It begins very early, even before birth. Babies are already tuned to speech, and newborns often prefer their mother’s voice. They can also tell the difference between their mother’s language and other languages. Researchers have explained language learning in different ways. B. F. Skinner argued that language is learned through reinforcement. Noam Chomsky argued that language ability is biologically...

language and cognition

How Language Shapes Thinking

Language shapes how people think, speak, and understand the world. Psychologists have debated whether language changes thought or whether thought comes first. The idea became well known in the 1940s through Edward Sapir and Benjamin Lee Whorf. They proposed linguistic determinism, the view that a language’s words and grammar determine how its speakers think and perceive reality. Sapir and Whorf argued that vocabulary can affect how people experience ideas. For example, languages with several...

problem-solving

Problem-Solving Strategies in Psychology

Problem-solving strategies help people find solutions after they identify the problem. Effective problem-solving has two steps. First, a person must identify the problem. Then they choose a plan of action that fits the situation. One strategy is trial and error. This means testing different solutions until one works. Thomas Edison used this approach when he tested thousands of filaments for the light bulb. It is not the most efficient method, but it can be useful when there is no clear path. <br...

trial and error and algorithm

Problem-Solving: Trial, Error, and Rules

Problem-solving strategies use different action plans to reach a solution. Trial and error is one common strategy. It means trying different solutions until one works. For example, fixing a broken printer may involve checking the ink levels, making sure the paper tray is not jammed, and confirming that the printer is connected to a laptop. Trial and error is useful, but it can take a long time. It is often used when there are only a few possible solutions to test. Thomas Edison used this...

heuristics

Heuristics in Everyday Problem Solving

Heuristics are problem-solving strategies that use mental shortcuts to make decisions easier. They give people a general way to solve a problem without following every step exactly. Unlike algorithms, which must be followed precisely to reach the correct result, heuristics are faster but can sometimes lead to less rational choices. People often use heuristics when there is too much information to process, not enough time, or not enough data. They are also common when the decision is not very...

reasoning

Reasoning in Problem Solving

Reasoning in problem solving is the process of thinking in a logical, sensible way to reach a conclusion. It helps people make decisions and think critically. Reasoning turns information into conclusions, which is useful in science and everyday life. One common type is inductive reasoning. Inductive reasoning means making a general rule from specific observations. It helps people form beliefs about the world. For example, if a cell phone is turned on many times and never explodes, a person may...

decision making

Automatic vs. Controlled Decisions

Decision-making is a basic cognitive process that helps people compare options and choose one. It can cover small choices, like what to wear, and larger ones, like picking a college major or a career path. The type of choice often shapes how the brain handles it. One approach is automatic decision-making. It is fast and intuitive, and it depends on gut feelings instead of careful reasoning. People often use it when they need to decide quickly or when the choice has low stakes, such as picking...

critical thinking

Critical Thinking in Science and School

Critical thinking in science and school means reflective, productive thinking that depends on evaluating evidence. Students who think critically try to understand the deeper meaning of ideas. They question assumptions and make independent choices about what to believe or do. Scientists often use critical thinking because they must look beyond the obvious. Good critical thinking also includes humility about what we know and what we do not know. That attitude helps people stay focused on the...

creative thinking

Divergent and Convergent Thinking

Creative thinking helps people solve problems with new and unusual ideas. It is not limited to improving an existing system. For example, instead of only trying to make a smartphone battery larger, creative thinking may lead to energy-efficient batteries or processors that use less power. This broader approach opens new paths to innovation. A key part of creative thinking is divergent thinking. Divergent thinking means generating many possible solutions to one problem. It often appears during...

intelligence

How Cultures Define Intelligence

Intelligence can mean different things across cultures. It refers to both behavior and individual ability, but people do not always define it the same way. In European American settings, intelligence is often linked to reasoning and cognitive skills. In other places, it is tied to social responsibility, memory, or practical skill. In Kenya, intelligence is connected to responsible participation in family and social life. In Uganda, it means knowing the right action and carrying it out...

cattell's theory of intelligence

Fluid vs. Crystallized Intelligence

Raymond Cattell and John Horn helped show that intelligence is not just one ability. They described two related but different kinds of intelligence: fluid intelligence and crystallized intelligence. Fluid intelligence is the ability to solve new problems and adjust to unfamiliar situations. People use it when they face a novel puzzle or need to think in a new way. Figuring out how to use a new gadget is one example of fluid intelligence. Crystallized intelligence is the knowledge and skills...

triarchic theory of intelligence

Sternberg's Three Types of Intelligence

Robert Sternberg's theory of intelligence divides mental ability into three connected parts: analytical intelligence, creative intelligence, and practical intelligence. This model shows that intelligence is not just one skill. It includes different ways people think and solve problems. Analytical intelligence is the type most like traditional IQ-based thinking. It involves analyzing information, evaluating ideas, and solving problems with logic. This form of intelligence is often linked to...

multiple intelligences theory

Gardner’s 9 Intelligences Explained

Howard Gardner’s theory of multiple intelligences describes nine distinct ways people can understand and interact with the world. First introduced in 1983 and later expanded, the framework challenges the idea that intelligence is only one general ability. Instead, it suggests that people may show strengths in different areas. Verbal-linguistic intelligence is the ability to think in words and use language to express ideas. Logical-mathematical intelligence supports math operations and logical...

measures of intelligence

How Psychologists Evaluate IQ Tests

Psychologists use standardized tests to measure intelligence, and the score they produce is called the intelligence quotient, or IQ. IQ tests are built around three key ideas: validity, reliability, and standardization. These principles help make the score meaningful and fair. Validity means a test measures what it claims to measure. For an intelligence test, that means it should assess intelligence rather than something else, like anxiety. One way to check this is criterion validity, which...

binet's contribution to measures of intelligence

binet-s-contribution-to-measures-of-intelligence

Binet and the First Intelligence Test

Alfred Binet and Théophile Simon created an early intelligence test to help identify students who had trouble learning through regular classroom instruction. In 1904, the French Ministry of Education asked them to design a method for this purpose. The goal was also to reduce overcrowding by placing some students in specialized schools. Binet and Simon built a test with 30 tasks. Some tasks were simple, such as touching the nose or ear after a command. Others were more complex, such as copying...

wechsler's contribution to measures of intelligence

wechsler-s-contribution-to-measures-of-intelligence

Wechsler IQ Tests and What They Measure

David Wechsler developed IQ tests that measure several parts of intelligence, not just one score. He was a psychologist who worked with World War I veterans, and in 1939 he created the Wechsler-Bellevue Intelligence Scale. His view of intelligence included purposeful action, rational thinking, and effective interaction with the environment. The Wechsler-Bellevue scale was innovative because it combined verbal and nonverbal subtests. A subtest is a smaller part of a larger test. This design...

the bell curve

Normal Distribution in Intelligence Scores

The normal distribution is a bell-shaped pattern used to describe many kinds of data, including intelligence test scores. It is symmetrical, with most values clustered around the mean, or average, and fewer values found farther from the center. Mathematician Carl Friedrich Gauss is closely linked to this pattern. This curve also appears in many natural measurements beyond intelligence, such as height. If a large group of women were measured, most heights would fall in the middle range. Fewer...

Intelligence is shaped by brain size, brain structure, genes, and environment. Brain size has a modest link to some skills, especially verbal ability, but it is a weaker predictor for spatial reasoning. This means intelligence cannot be explained by size alone. Brain structure also matters. For example, Einstein had a smaller-than-average brain, but his parietal cortex was 15% wider. The parietal cortex helps with spatial reasoning, so this suggests that neural density may matter more than...

environmental influences on intelligence

How Early Childhood Shapes IQ

Early childhood experiences can shape intelligence and IQ. Genetics matter, but a child’s environment can still change outcomes in a meaningful way. Research shows that enriched surroundings support academic success and help children build important thinking skills. The transcript also shows that environment affects other traits, such as height. Even though more than 90% of height variation comes from genetic differences, nutrition still plays a clear role. The same pattern appears in...

key terms and concepts

Learn how brain size, brain regions, PFC development, genes, and environment all contribute to intelligence in high school psychology and biology.

How Brain Growth Shapes Intelligence | JoVE K12

JoVE Core Introduction to Psychology offers an engaging learning experience on the fundamental principles of psychology through concise video lessons. Students will explore important topics such as cognitive processes, emotional regulation, and neural mechanisms, establishing a strong foundation in the study of the mind and human behavior. This series provides an accessible and captivating approach to grasp the essential concepts of the discipline.

introduction to psychology

How Brain Growth Shapes Intelligence

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