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09:35
Environmental Modulations of the Number of Midbrain Dopamine Neurons in Adult Mice
Published on: January 20, 2015
Dopamine and serotonin systems modify environmental effects on human behavior: a review
Liisa Keltikangas-Järvinen1, Johanna Salo
1Department of Psychology, University of Helsinki, Finland. liisa.keltikangas-jarvinen@helsinki.fi
Scandinavian Journal of Psychology
|November 26, 2009
Summary
Human behavior is shaped by both genes and environment. Gene variants influence how individuals respond to life experiences, impacting psychological outcomes like temperament and depression.
Area of Science:
- Behavioral Genetics
- Psychological Science
Background:
- The interplay between genetic and environmental factors in human behavior is a long-standing debate.
- Recent research emphasizes the joint effects of genes and environment, particularly over the life course.
- Gene-environment interactions are increasingly recognized as crucial for understanding psychological outcomes.
Purpose of the Study:
- To investigate how genetic variants moderate the impact of environmental conditions on psychological outcomes.
- To explore the significance of gene x environment interactions compared to direct gene-trait associations.
Main Methods:
- Analysis of behavioral genetic studies.
- Examination of variants in serotonergic and dopaminergic genes.
- Assessment of psychological outcomes including temperament, depression, hostility, and educational attainment.
Main Results:
- Specific variants of serotonergic and dopaminergic genes were found to moderate the influence of environmental factors.
- Individuals with different genotypes exhibited differential sensitivity to environmental conditions.
- Gene x environment interactions appear more significant than direct gene-trait associations for psychological outcomes.
Conclusions:
- Genetic background influences an individual's vulnerability and sensitivity to environmental factors.
- The effects of genes on psychological outcomes are often evident only within the context of environmental influences.
- Gene-environment interactions are critical for a comprehensive understanding of human behavior development.
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