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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's smaller-than-average brain, his parietal cortex, which is involved in spatial reasoning, was 15% wider, suggesting that neural density might matter...

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Language serves as a bridge between ideas and communication, influencing how individuals perceive and interact with the world. Psychologists have long debated whether language shapes thought or vice versa. This discussion gained grip with Edward Sapir and Benjamin Lee Whorf in the 1940s, who proposed that language determines thought, a concept known as linguistic determinism. They suggested that the vocabulary and structure of a language influence how its speakers think and perceive reality.

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Related Experiment Video

Updated: Jun 25, 2025

Brain Morphology of Cannabis Users With or Without Psychosis: A Pilot MRI Study

Brain Morphology of Cannabis Users With or Without Psychosis: A Pilot MRI Study

Published on: August 18, 2020

Intelligence and cortical morphometry: caveats in brain-behavior associations.

John D Lewis¹, Vandad Imani², Jussi Tohka³

¹Program in Neuroscience and Mental Health, The Hospital for Sick Children Research Institute, 555 University Avenue, Toronto, ON, M5G1X8, Canada.

Brain Structure & Function

|May 25, 2024

Summary

This summary is machine-generated.

Brain volume alone reliably predicts intelligence (IQ). Cortical thickness and peri-cortical contrast do not improve prediction accuracy, clarifying previous research discrepancies in brain-intelligence relationships.

Keywords:

Brain size Collinearity Confounds Intelligence Morphometry

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Area of Science:

Neuroscience
Cognitive Psychology
Psychometrics

Background:

Brain size is linked to intelligence, but relationships with cortical morphometrics like thickness and contrast are inconsistent.
Previous studies show conflicting results or no significant links between intelligence and cortical measures, possibly due to statistical issues or incomplete modeling of brain size effects.

Purpose of the Study:

To investigate if cortical thickness and peri-cortical contrast enhance intelligence prediction beyond brain volume.
To offer a methodological explanation for discrepancies in prior research on brain morphometrics and intelligence.

Main Methods:

Analyzed multiple datasets including child, developmental, and adult data.
Utilized data from single and multi-site acquisitions, and different MRI scanner manufacturers.
Assessed prediction accuracy for fluid intelligence, full-scale IQ, performance IQ, and verbal IQ.

Main Results:

Neither cortical thickness nor peri-cortical contrast significantly improved IQ prediction accuracy when brain volume was already considered.
Findings were consistent across diverse datasets, acquisition methods, and intelligence measures.

Conclusions:

Brain volume is a key predictor of intelligence, but cortical thickness and peri-cortical contrast offer limited additional predictive value.
The study highlights a methodological caveat, explaining inconsistencies in previous research and emphasizing the importance of accounting for brain size effects.