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Related Concept Videos

Genetic Drift03:33

Genetic Drift

Natural selection—probably the most well-known evolutionary mechanism—increases the prevalence of traits that enhance survival and reproduction. However, evolution does not merely propagate favorable traits, nor does it always benefit populations.Life is not fair. A deer grazing contentedly in a field can have her meal cut tragically short by a bolt of lightning. If the doomed doe is one of only three in the population, 1/3 of the population’s gene pool is lost. Random events like this can...
Evolutionary Psychology01:20

Evolutionary Psychology

Evolutionary psychology explores the origins of human behavior and mental processes by framing them within the context of natural selection, a theory famously propounded by Charles Darwin. This field asserts that many behaviors common across human societies — ranging from instinctive fear reactions to complex social interactions — arose as evolutionary adaptations. These adaptations enhanced the survival and reproductive success of our ancestors, thereby becoming embedded in the human psyche...
Mutation, Gene Flow, and Genetic Drift01:09

Mutation, Gene Flow, and Genetic Drift

In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).Mechanisms of Genetic VariationThe original sources of genetic variation are mutations,...
Instinctive Drift01:05

Instinctive Drift

Instinctive drift refers to the tendency of animals to revert to their innate behaviors despite repeated reinforcement. Breland and Breland demonstrated this concept in an experiment with a raccoon. The raccoon was trained to pick up two coins and place them in a container in exchange for food. Initially, the raccoon learned to associate the coins with food, making them a conditioned stimulus or a substitute for food. However, over time, the raccoon became less willing to put the coins into the...
Evolution of New Traits in Microbes01:24

Evolution of New Traits in Microbes

Microorganisms evolve rapidly due to their large population sizes and short generation times, often exhibiting measurable changes within days under laboratory conditions. Natural selection acts on standing genetic variation, enabling the retention and amplification of beneficial traits that confer fitness advantages in changing environments.Adaptive Pigment Regulation in RhodobacterIn Rhodobacter, a genus of purple non-sulfur bacteria, light-harvesting pigments such as bacteriochlorophyll and...
Criticisms of the Evolutionary Perspective01:23

Criticisms of the Evolutionary Perspective

In a study where individuals posing as strangers offered compliments and proposed casual sex to students, the responses differed significantly based on gender. Not a single woman accepted the proposal, while 70% of the men agreed. This outcome provides a useful scenario to explore through the lens of evolutionary psychology and social learning theory, highlighting the diverse perspectives on human sexual behaviors.
Evolutionary psychology provides one explanation for these findings, suggesting...

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Use of Implementation Science for a Sustained Reduction of Central-Line-Associated Bloodstream Infections in a High-Volume, Regional Burn Unit.

Infection control and hospital epidemiology·2017
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Following the Dynamics of Structural Variants in Experimentally Evolved Populations
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Following the Dynamics of Structural Variants in Experimentally Evolved Populations

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Evolutionary drift in systems of care development.

Knute Rotto1, Janet McIntyre

  • 1Choices, Inc., 4701 N. Keystone Avenue, Suite 150, Indianapolis, IN 46205, USA.

Evaluation and Program Planning
|June 26, 2009
PubMed
Summary

Expanding systems of care beyond severely disturbed youth benefits all children and families. A public health approach ensures timely, needs-driven support, preventing costly intensive services later.

Area of Science:

  • Child and Adolescent Psychiatry
  • Public Health
  • Healthcare Systems

Background:

  • Defining systems of care requires specifying the population served.
  • Current definitions often narrowly focus on children and youth with serious emotional disturbance.
  • This narrow focus excludes a significant majority of youth with mental health needs.

Discussion:

  • A broader, public health approach to systems of care is advocated.
  • Serving all children and families with appropriate support prevents escalation to intensive services.
  • This inclusive model promotes community stability and efficient resource allocation.

Key Insights:

  • Systems of care should adopt a needs-driven, rather than agency-driven, model.
  • Early and appropriate intervention for all youth mental health needs is crucial.

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  • Community preferences should guide the development of comprehensive care systems.

    • Outlook:

    • Wider adoption of a public health framework for child and family mental health services.
    • Potential for reduced long-term healthcare costs through early intervention.
    • Development of more responsive and equitable community-based support systems.