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Brains, innovations and evolution in birds and primates
Louis Lefebvre1, Simon M Reader, Daniel Sol
1Department of Biology, McGill University, Montreal, Quec., Canada. louis.lefebvre@mcgill.ca
Brain, Behavior and Evolution
|April 16, 2004
Summary
Behavioral innovation, a measure of cognition, correlates with larger brain association areas in birds and primates. This finding suggests convergent evolution of cognitive traits across diverse species, aiding in environmental adaptation and diversification.
Area of Science:
- Comparative cognition
- Neuroscience
- Evolutionary biology
Background:
- Variation in brain size is linked to cognitive, life history, and ecological traits.
- Behavioral innovation rate serves as an operational measure for cognition in comparative studies.
Purpose of the Study:
- To review research linking behavioral innovation to brain size and cognitive evolution.
- To explore similarities in cognitive trait evolution between birds and primates.
Main Methods:
- Correlating the frequency of behavioral innovation with relative brain size, specifically association areas.
- Examining the relationship between innovation rate and factors like tool use, learning, and environmental adaptation.
Main Results:
- Innovation rate positively correlates with the relative size of association areas (hyperstriatum ventrale/neostriatum in birds, isocortex/striatum in primates).
- Innovation rate is linked to tool use, interspecific learning differences, and environmental adaptability in birds.
- Cognitive traits appear to have evolved similarly in primates and multiple avian lineages.
Conclusions:
- Behavioral innovation is a valuable metric for quantifying cognitive differences across taxa.
- Convergent evolution of cognitive abilities is evident in birds and primates.
- Understanding innovation rate aids in testing hypotheses about brain evolution and diversification.