Happiness as a Stochastic Phenomenon

Abstract

  • Subject of Study: Happiness, or subjective well-being, measured in a sample of middle-aged twins.

  • Methodology: Utilized the Well-Being (WB) scale from the Multidimensional Personality Questionnaire (MPQ).

  • Key Findings:

    • Neither socioeconomic status (SES), educational attainment, family income, marital status, nor religious commitment explained more than 3% of variance in WB.

    • Genetic variation accounts for 44% to 52% of the variance in WB.

    • Estimated heritability of stable happiness component is approximately 80%.

Introduction

  • Conceptual Background:

    • Personal happiness is commonly perceived as contingent upon external factors such as income and social status.

    • Questions under investigation:

    • Does economic status correlate with happiness?

    • Are men or women inherently happier?

    • Do relationships and social standings affect contentment?

  • Supporting Literature:

    • Myers and Diener (1995) indicated that happiness remains relatively stable and individuals adapt to life circumstances.

Methodology

  • Sample: 2310 members from Minnesota Twin Registry assessing self-reported happiness ratings.

  • Questionnaire Design: Rated happiness on a 5-point scale:

    • 1 = lowest 5%

    • 2 = lower 30%

    • 3 = middle 30%

    • 4 = upper 30%

    • 5 = highest 5%

  • Demographics: Sample shows diverse educational backgrounds and social circumstances.

Key Findings

Happiness Ratings and Adaptation

  • Adaptation Observed:

    • Individuals show remarkable adaptation to both positive and negative events.

    • Happiness set point varies by individual, despite socioeconomic factors.

  • Gender Differences:

    • Women rated themselves equally as happy as men, with 86% of twins indicating they are in the upper 35% of contentment.

Illusory Superiority in Self-Ratings

  • Most individuals perceive themselves above average in positive traits, particularly in contentment, where 42% score high in intelligence ratings.

Natural Selection and Happiness

  • Speculation that natural selection favored happier individuals due to reproductive success.

Results and Analysis

Correlations between Happiness and Social Variables

  • Socioeconomic Status Impact:

    • SES and educational attainment had negligible impact on happiness variance (<3%).

  • Marital Status Impact:

    • Minimal difference noted between married (mean WB = 50.1) and never-married (mean WB = 48.3).

    • Marital status accounts for less than 1% of variance in both WB and subjective well-being (SWB).

Traditional Values and Their Role in Happiness

  • Limited correlation between traditional values/scores on the Traditionalism scale and happiness ratings.

  • Suggested that religiousness or conversions likely do not heavily dictate happiness variance.

Heritability of Happiness

  • Study of Twins:

    • Utilized MPQ on younger twins (20 to 30 years) to understand changes over time.

    • Results indicate:

    • Correlation for monozygotic twins (MZ) higher (0.40) compared to dizygotic twins (DZ) (0.07).

    • Conclusion that happiness is primarily an emergenic trait influenced by genetics, rather than one directly inherited.

Statistical Data

Correlation Overview

  • Table of Intraclass Correlations: From MPQ Studies

    • MZ Twins Reared Together: n = 647, Intraclass R = 0.44 (2.03)

    • DZ Twins Reared Together: n = 733, Intraclass R = 0.08 (2.04)

    • MZ Twins Reared Apart: n = 75, Intraclass R = 0.52 (0.10)

    • DZ Twins Reared Apart: n = 36, Intraclass R = -0.02 (2.17)

Conclusions on Individual Differences in Happiness

  • Individual happiness is seen as largely determined by genetic predispositions, combined with unique personal experiences.

  • Extreme environmental factors might lead to temporary changes, but overall stable characteristics are dictated by genetic factors.

Implications and Further Discussion

  • Behavior and Mood:

    • Reversal of causal assumptions regarding behaviors influencing mood, versus mood influencing behaviors.

    • The study proposes that perceived behavioral happiness may derive from intrinsic feelings rather than vice versa.

  • Final Conclusion:

    • The nature of individual happiness might reflect an individual's genetic lottery rather than mere chance occurrence or lifestyle choices.

References

  1. Lykken, D.T. et al. (1982). Emergenesis in twins.

  2. Myers, D. G., & Diener, E. (1995). Subjective well-being studies.

  3. Tellegen, A. (1982). Manual for the MPQ.

  4. Watson, D., & Tellegen, A. (1985). Structure of mood.