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Gene Duplication and Divergence02:37

Gene Duplication and Divergence

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The seminal work of Ohno in 1970 popularized the idea of gene duplication and divergence. DNA sequence comparison studies reveal that a large portion of the genes in bacteria, archaebacteria, and eukaryotes was  generated by gene duplication and divergence, indicating its critical role in evolution.
The duplicated copies of the gene are called Paralogs. Paralogs with similar sequences and functions form a gene family. Across several species, a large number of gene families are...
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Gene Families01:57

Gene Families

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Gene families consist of groups of genes proposed to have originated from a common ancestor. Typically these arise through events in which a gene or genes are mistakenly duplicated during cell division. Unlike their parent genes (which are subject to selection pressure to maintain function), these gene copies do not need to preserve their sequences and may evolve at a relatively faster rate.
Occasionally these regions can be adapted to take on new roles within the organism, becoming novel genes...
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Duplication of Chromatin Structure02:05

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The process of chromosome duplication during cell division requires genome-wide disruption and re-assembly of chromatin. The chromatin structure must be accurately inherited, reassembled, and maintained in the daughter cells to ensure lineage propagation.
The basic unit of the chromatin is the nucleosome, consisting of DNA wrapped around octameric histone proteins and short stretches of linker DNA separating individual nucleosomes. The histone proteins within the nucleosome have their...
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Generalization, Discrimination, and Extinction01:24

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Generalization, discrimination, and extinction are key concepts in operant conditioning that influence how behaviors are learned and maintained.
Generalization occurs when a behavior reinforced in one context is performed in similar situations. For instance, a student who studies diligently for calculus and receives excellent grades might apply the same study habits to psychology and history, expecting similar results. Generalization shows how learning in one setting can influence behavior in...
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Conservation of Protein Domains Over Different Proteins02:26

Conservation of Protein Domains Over Different Proteins

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Protein domains are small structurally independent units that are part of a single amino acid chain.  Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to...
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Conservation of Protein Domains02:26

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Hebbian learning can explain rhythmic neural entrainment to statistical regularities.

Developmental scienceยท2024
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Related Experiment Video

Updated: Jan 4, 2026

Imaging Replicative Domains in Ultrastructurally Preserved Chromatin by Electron Tomography
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Duplications and domain-generality.

Ansgar D Endress1

  • 1City, University of London.

Psychological Bulletin
|November 1, 2019
PubMed
Summary
This summary is machine-generated.

Human cognition may not be domain-specific or domain-general. Instead, "domain-bound" cognitive mechanisms are proposed, which are adaptable across multiple domains but not all, offering a new perspective on cognitive architecture.

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Area of Science:

  • Cognitive Science
  • Evolutionary Psychology
  • Neuroscience

Background:

  • Ongoing debate in human cognition regarding domain-specific (specialized) versus domain-general (general-purpose) mechanisms.
  • Adaptive behavioral traits are common across the animal kingdom, prompting questions about human cognitive uniqueness.

Purpose of the Study:

  • To challenge the dichotomy of domain-specificity versus domain-generality in cognitive mechanisms.
  • To propose and define a new category of cognitive mechanisms: 'domain-bound'.

Main Methods:

  • Synthesized research from artificial language learning, associative learning, serial learning, executive control, and formal linguistics.
  • Theoretical argumentation based on existing empirical evidence and evolutionary principles.

Main Results:

  • Identified 'domain-bound' cognitive mechanisms: available in multiple, but not all, domains.
  • Demonstrated that domain-bound mechanisms can be recruited by various domains simultaneously and show uncorrelated abilities across domains.
  • Proposed an evolutionary interpretation of domain-bound mechanisms through gene duplication and independent evolution.

Conclusions:

  • Neither strict domain-specificity nor domain-generality adequately describes cognitive implementation.
  • Domain-bound mechanisms offer a more nuanced understanding of cognitive architecture.
  • Re-evaluation of 'domain-general' mechanisms may reveal them as collections of duplicated, specialized mechanisms.