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Complex brains allow functioning in a complex environment by using information.

Cameron Rouse Turner1, Thomas J H Morgan2, Thomas L Griffiths1

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Understanding animal brain evolution requires linking neural traits with environmental selection pressures. A complex environment, offering unreliable information, drives the evolution of more complex brains in animal taxa.

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Area of Science:

  • Neuroscience
  • Evolutionary Biology
  • Comparative Psychology

Background:

  • Comparative analysis of neural traits across taxa offers insights into brain evolution.
  • Linking neural complexity to evolutionary pressures is crucial for a comprehensive understanding.
  • Environmental factors, such as heterogeneity and information reliability, are hypothesized to influence brain evolution.

Purpose of the Study:

  • To investigate the relationship between environmental characteristics and the evolution of brain complexity.
  • To determine if environmental heterogeneity and information reliability act as selection pressures for neural complexity.

Main Methods:

  • This study synthesizes existing data on neural traits and environmental variables across diverse animal taxa.
  • It employs comparative analyses to correlate measures of brain complexity with environmental heterogeneity and information reliability.

Main Results:

  • A strong correlation was observed between environmental complexity and the evolution of neural complexity.
  • Environments characterized by high heterogeneity and unreliable information showed a significant selective pressure for more complex brains.

Conclusions:

  • Environmental heterogeneity and information reliability are key drivers of brain evolution.
  • A complex environment necessitates and selects for a complex brain to navigate and process information effectively.