Related Experiment Video
Updated: Jul 14, 2026
10:13
Assessment of Age-related Changes in Cognitive Functions Using EmoCogMeter, a Novel Tablet-computer Based Approach
Published on: February 14, 2014
Genotype-environment interactions: cognitive aging and social factors
Chandra A Reynolds1, Margaret Gatz, Stig Berg
1University of California Riverside, Department of Psychology, Riverside, CA 92521, USA. chandra.reynolds@ucr.edu
Summary
Genetic variations influence how aging affects memory. Some gene variants may protect against memory decline, while others make individuals more susceptible to environmental factors like depression.
Area of Science:
- Behavioral Genetics
- Neuroscience
- Aging Research
Background:
- Genotype-environment interactions are crucial for understanding individual differences in cognitive aging.
- The Swedish Adoption Twin Study of Aging (SATSA) provides a unique dataset to explore genetic and environmental influences on memory.
- Monzygotic (MZ) twins share nearly identical genes, allowing for the examination of non-shared environmental effects on cognitive variability.
Purpose of the Study:
- To investigate genotype-environment interactions in memory performance and longitudinal change using MZ twin pairs.
- To identify specific genes associated with variability in semantic and episodic memory change.
- To explore the moderating role of social and stress factors, such as depressive symptoms, on gene-environment relationships in memory.
Main Methods:
- Utilized an MZ twin pair difference approach within the SATSA cohort (150 pairs).
- Analyzed intrapair variability in memory performance and longitudinal change.
- Examined candidate genes including APOE, ESR1, HTR2A, and 5HTT, and correlated them with environmental factors like social support, life events, and depressive symptoms.
Main Results:
- Identified multiple 'variability genes' associated with longitudinal semantic memory change (APOE, ESR1, HTR2A, 5HTT) and episodic memory change (5HTT).
- Found that MZ twin pairs carrying risk alleles exhibited less variability, suggesting non-carriers might be more sensitive to environmental contexts.
- Depressive symptoms emerged as a potential moderator, indicating that individuals with risk alleles may be less affected by depression-evoking environments compared to non-carriers.
Conclusions:
- Specific genes interact with environmental factors to influence memory change during aging.
- Non-carriers of certain risk alleles may be more vulnerable to environmental influences, particularly depressive symptoms, affecting semantic memory resilience.
- Future research should focus on larger sample sizes and a broader range of contextual factors to further elucidate gene-environment interactions in cognitive aging.
Related Concept Videos
01:28Causes of Social Behavior III: Biological and Environmental Influences
Social behavior is a complex phenomenon that arises from the interaction between biological predispositions and environmental influences. This intricate interplay shapes how individuals think, feel, and act in various social contexts. Understanding these mechanisms requires insights from psychology, neuroscience, genetics, and evolutionary theory.Environmental Influences on Social BehaviorEnvironmental factors, including temperature, odors, and visual stimuli, play a crucial role in shaping...
01:30Cognitive Development During Adulthood
Cognitive development continues throughout adulthood, undergoing significant shifts across early, middle, and late stages. Individual transition occurs from adolescent idealism to pragmatic and adaptable thinking in early adulthood. During this period, individuals learn to integrate personal beliefs with the recognition that other perspectives are equally valid. Exposure to the complexities of modern society, diverse experiences, and higher education contribute to this adaptive thought process,...
02:27Background and Environment Affect Phenotype
Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
01:20Gene-Environment Interactions
Gene expression is a dynamic process that is significantly influenced by environmental factors. This interaction underlies the complex nature of biological development and the phenotypic differences observed among individuals, even among those with identical genetic makeups. Factors such as radiation, temperature, behavior, nutrition, and stress play pivotal roles in determining how genes are expressed. The concept of the reaction range is central to understanding this interaction. It posits...
01:15Causes of Social Behavior II: Cognitive Processes
Cognitive processes affect social behavior by guiding how individuals perceive, interpret, and respond to social stimuli. These mental processes enable individuals to assess others' behaviors, attribute causes to their actions, and form expectations based on past experiences.Causes of Behavior and Social JudgmentsIndividuals determine the causes of others' behaviors by distinguishing between personal traits and external circumstances. For example, if a friend frequently arrives late, an...
01:23Cognition and Behavior
Social psychology examines the complex interplay between individual mental processes and social interactions. Historically, the field was divided into two domains: social behavior and social cognition. Researchers focusing on social behavior analyzed actions within social contexts, such as conformity, aggression, or cooperation. Meanwhile, social cognition researchers investigated how people perceive, interpret, and mentally represent their social environments. However, modern perspectives no...