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Related Concept Videos

Longitudinal Research02:20

Longitudinal Research

Sometimes we want to see how people change over time, as in studies of human development and lifespan. When we test the same group of individuals repeatedly over an extended period of time, we are conducting longitudinal research. Longitudinal research is a research design in which data-gathering is administered repeatedly over an extended period of time. For example, we may survey a group of individuals about their dietary habits at age 20, retest them a decade later at age 30, and then again...
Longitudinal Studies01:26

Longitudinal Studies

Longitudinal studies are also widely used in other medical and social science fields. For instance, in cardiovascular research, they can monitor patients' health over decades to identify risk factors for heart disease, such as high cholesterol or smoking, and evaluate the long-term effectiveness of preventive measures. Similarly, in mental health studies, researchers might follow individuals from adolescence into adulthood to understand the development and progression of conditions like...
Human Genetics01:28

Human Genetics

Human genetics provides a profound framework for understanding the interplay between genetic predispositions and human psychology. At the heart of this discipline lies the study of how genes influence physical traits, behaviors, and susceptibility to diseases. Each person carries a unique genetic code that subtly or significantly shapes their psychological and behavioral landscape.
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Biological Influences on Intelligence01:30

Biological Influences on Intelligence

Intelligence is often thought to be linked to brain size, but the relationship is more complex than that. While brain size does correlate modestly with some abilities, like verbal skills, the connection is weaker for others, such as spatial reasoning. Other factors, like brain structure, also play crucial roles. For instance, despite Einstein's smaller-than-average brain, his parietal cortex, which is involved in spatial reasoning, was 15% wider, suggesting that neural density might matter more...

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Related Experiment Video

Updated: Jul 20, 2026

Generalized Psychophysiological Interaction (PPI) Analysis of Memory Related Connectivity in Individuals at Genetic Risk for Alzheimer's Disease
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Longitudinal genetic analysis of executive function in elderly men.

Christina N Lessov-Schlaggar1, Gary E Swan, Terry Reed

  • 1Center for Health Sciences, SRI International, 333 Ravenswood Avenue, Menlo Park, CA 94025, USA. christina.lessov-schlaggar@sri.com

Neurobiology of Aging
|September 13, 2006
PubMed
Summary

Genetic factors significantly influence executive function (EF) performance over time. While common genetic factors underlie performance, individual-specific environmental effects impact decline, especially over longer periods.

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Area of Science:

  • Neuroscience
  • Behavioral Genetics
  • Psychology

Background:

  • Executive function (EF) is crucial for cognitive control.
  • Understanding genetic and environmental influences on EF is vital for aging research.
  • Longitudinal studies are needed to track changes in EF over time.

Purpose of the Study:

  • To determine the heritability of executive function performance and decline.
  • To investigate the role of APOE epsilon4 allele in executive function variability.
  • To differentiate genetic and environmental contributions to longitudinal executive function changes.

Main Methods:

  • Utilized a population-based prospective twin study (NHLBI twin study) of male WWII veterans.
  • Administered three executive function tests across three time points (baseline, 9-year, and 13-year follow-up).
  • Incorporated APOE epsilon4 allele status into genetic models to assess its impact on longitudinal variability.

Main Results:

  • Mean executive function performance declined significantly over time.
  • High genetic correlations were observed for EF performance across assessments.
  • Significant genetic influences were found for 9- and 13-year decline in digit symbol performance.
  • Individual-specific environmental effects influenced decline in the last 4-year follow-up period.
  • APOE epsilon4 allele status did not substantially alter the magnitude of genetic effects.

Conclusions:

  • Common genetic factors significantly contribute to longitudinal executive function task performance.
  • Genetic influences on executive function decline become apparent over longer assessment intervals.
  • Environmental factors play a role in executive function decline, particularly in shorter time frames.