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What is Natural Selection?

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Natural selection is an evolutionary process in which individuals with survival-promoting traits reproduce at higher rates. These favorable traits become more common within a population or species. Naturally selected traits initially arise via random genetic mutations. In order for selection to occur, there must be variation within a population, the trait controlling the variation must be heritable, and there must be an evolutionary advantage for variation in the trait.

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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.

Natural Selection and Adaptation

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Natural selection, a fundamental concept in evolutionary biology, is the mechanism by which evolution is driven, favoring organisms that are best adapted to their environments. This process enhances their chances of survival and reproduction. Adaptation, a key outcome of this process, involves genetic modifications that optimize an organism's functionality under specific environmental challenges, such as extreme cold or thinner air at high altitudes.
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Related Experiment Video

Updated: Feb 19, 2026

Experience is Instrumental in Tuning a Link Between Language and Cognition: Evidence from 6- to 7- Month-Old Infants' Object Categorization

Experience is Instrumental in Tuning a Link Between Language and Cognition: Evidence from 6- to 7- Month-Old Infants' Object Categorization

Published on: April 19, 2017

Natural selection and language genes in humans.

Rob DeSalle¹, Guilherme Lepski^2,3, Analia Arévalo³

¹Institute for Comparative Genomics, American Museum of Natural History, 79th at Central Park West, New York, NY, 10024, USA. desalle@amnh.org.

Scientific Reports

|February 17, 2026

Summary

Natural selection impacted neural genes related to language in human ancestors. Neanderthals and Denisovans showed bursts of selection on language genes, unlike modern humans.

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Last Updated: Feb 19, 2026

Experience is Instrumental in Tuning a Link Between Language and Cognition: Evidence from 6- to 7- Month-Old Infants' Object Categorization

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Following the Dynamics of Structural Variants in Experimentally Evolved Populations

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Published on: February 3, 2023

Area of Science:

Evolutionary biology
Genetics
Neuroscience
Primate evolution

Background:

Articulate language is a defining human trait.
Understanding the genetic basis of language evolution is crucial.
Comparative genomics across primate lineages can reveal evolutionary pressures.

Purpose of the Study:

To identify candidate genes associated with articulate language.
To analyze the effects of natural selection on these genes in primate lineages.
To investigate evolutionary differences in neural gene selection related to language between Homo sapiens, Neanderthals, and Denisovans.

Main Methods:

Constructed lists of over 100 candidate genes for articulate language.
Analyzed coding regions for natural selection effects (directional episodic, relaxed/intensified selection).
Compared selection patterns across 34 nonhuman primate species, Homo sapiens, Neanderthals, and Denisovans.

Main Results:

A significant burst of altered selection effects on neural genes occurred at the node leading to the Homo sapiens-Neanderthal-Denisova triad.
Subsequent bursts of selection on language-related neural genes were observed in Denisovan and Neanderthal lineages.
These increases in Neanderthals and Denisovans contrast with minimal selection on the same genes in the Homo sapiens lineage.
Genes involved were primarily related to synapse structure and maintenance.

Conclusions:

Neural genes related to language underwent distinct evolutionary selection pressures in recent hominin lineages.
Neanderthals and Denisovans experienced significant selection on genes involved in synaptic function, potentially impacting language capabilities.
A hypothesis is proposed linking synaptic efficiency to language acquisition differences in these hominin groups.