Evidence-based

This section holds concepts that have been tested directly — through experiments, meta-analyses, or validated scales published in peer-reviewed journals. That doesn’t mean “proven forever”: science revises itself, and correlation isn’t the same as causation. But this is the strongest level of grounding we have.

1. Prospect Theory / Loss Aversion

   Daniel Kahneman, Amos Tversky (1979) — Prospect Theory: An Analysis of Decision under Risk

   The Nobel-winning work showing that losses are felt subjectively about twice as strongly as equivalent gains — which explains patterns of risk avoidance and of getting 'stuck' in disadvantageous decisions.

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2. Procrastination Meta-Analysis

   Piers Steel (2007) — The Nature of Procrastination: A Meta-Analytic and Theoretical Review of Quintessential Self-Regulatory Failure

   A meta-analysis of 691 correlations showed that procrastination is most strongly associated with low self-efficacy, impulsiveness and task aversiveness — not with laziness as a character trait.

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3. Intolerance of Uncertainty

   Michel J. Dugas, France Gagnon, Robert Ladouceur, Mark H. Freeston (1998) — Generalized Anxiety Disorder: A Preliminary Test of a Conceptual Model

   A foundational model of generalized anxiety disorder in which the inability to tolerate uncertainty is the key mechanism generating chronic worry and avoidance behavior.

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4. Self-Determination Theory

   Richard M. Ryan, Edward L. Deci (2000) — Self-Determination Theory and the Facilitation of Intrinsic Motivation, Social Development, and Well-Being

   A classic work showing that sustained motivation and well-being depend on satisfying three basic needs — autonomy, competence and relatedness.

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5. Contingent Self-Worth

   Jennifer Crocker, Connie T. Wolfe (2001) — Contingencies of Self-Worth

   Shows that when a person's self-esteem is tied to external achievements (success, approval, appearance), it leaves the psyche chronically vulnerable to any failure in that domain.

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6. Impostor Phenomenon

   Pauline Rose Clance, Suzanne Ament Imes (1978) — The Imposter Phenomenon in High Achieving Women: Dynamics and Therapeutic Intervention

   The first clinical description of the phenomenon in which successful people attribute their achievements to luck or to deceiving others rather than to their own ability.

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7. Social Comparison Theory

   Leon Festinger (1954) — A Theory of Social Comparison Processes

   A foundational theory that people evaluate themselves by comparison with others, especially when objective criteria are lacking — the source of constant self-comparison and its emotional consequences.

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8. Rejection Sensitivity

   Geraldine Downey, Scott I. Feldman (1996) — Implications of Rejection Sensitivity for Intimate Relationships

   Shows that people who anxiously anticipate rejection tend to perceive it where it is absent and to overreact — which in itself damages close relationships.

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9. Cognitive Dissonance Theory

   Leon Festinger (1957) — A Theory of Cognitive Dissonance

   The classic theory of the psychological discomfort caused by contradictory beliefs or actions and of how people distort reality to relieve that discomfort.

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10. Multidimensional Perfectionism Scales

    Randy O. Frost, Patricia Marten, Cathleen Lahart, Robin Rosenblate (1990); Paul L. Hewitt, Gordon L. Flett (1991) (1990-1991) — The Dimensions of Perfectionism (Frost et al., 1990); Perfectionism in the Self and Social Contexts: Conceptualization, Assessment, and Association with Psychopathology (Hewitt & Flett, 1991)

    Two independent but complementary validated scales that broke perfectionism down into measurable components — from fear of mistakes to the pressure of socially prescribed standards.

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11. Locus of Control

    Julian B. Rotter (1966) — Generalized Expectancies for Internal versus External Control of Reinforcement

    The foundational work that introduced the concept of locus of control — the enduring belief about whether life outcomes depend on one's own efforts or on external forces.

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12. Attribution Theory (Success/Failure)

    Bernard Weiner (1985) — An Attributional Theory of Achievement Motivation and Emotion

    Shows that what a person attributes their successes and failures to (ability, effort, luck, task difficulty) directly shapes their future motivation and emotions.

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13. Cognitive Distortions / Disqualifying the Positive

    David D. Burns (1980) — Feeling Good: The New Mood Therapy

    The book that popularized the CBT catalogue of cognitive distortions, including 'disqualifying the positive' — the habit of dismissing good things as 'not counting'.

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14. Maslach Burnout Inventory

    Christina Maslach, Susan E. Jackson (1981) — The Measurement of Experienced Burnout

    The work that introduced a validated burnout scale with three components — emotional exhaustion, depersonalization and reduced personal accomplishment.

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15. Decisional Procrastination

    Beverly R. Effert, Joseph R. Ferrari (1989) — Decisional Procrastination: Examining Personality Correlates

    Distinguishes two types of procrastination — avoiding the action itself and avoiding making the decision — which matters for different patterns of indecision.

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16. Implementation Intentions

    Peter M. Gollwitzer (1999) — Implementation Intentions: Strong Effects of Simple Plans

    Demonstrates that simple 'if situation X, then I will do Y' plans significantly increase the likelihood of reaching a goal compared with intention alone.

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17. Scarcity Mindset

    Sendhil Mullainathan, Eldar Shafir (2013) — Scarcity: Why Having Too Little Means So Much

    Shows that scarcity (of money, time, etc.) by itself captures cognitive resources and tunnels attention, degrading the quality of decisions regardless of a person's individual traits.

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18. Hedonic Adaptation

    Philip Brickman, Donald T. Campbell (1971) — Hedonic Relativism and Planning the Good Society

    The work that first described people's tendency to return to a baseline level of happiness after both good and bad events — the basis of the 'hedonic treadmill'.

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19. Arrival Fallacy

    Tal Ben-Shahar (2007) — Happier: Learn the Secrets to Daily Joy and Lasting Fulfillment

    A term coined by a Harvard psychologist for the false belief that reaching a goal will in itself bring lasting happiness.

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20. Role conflict / work-family conflict

    Robert L. Kahn, Donald M. Wolfe, Robert P. Quinn, J. Diedrick Snoek, Robert A. Rosenthal (1964) — Organizational Stress: Studies in Role Conflict and Ambiguity

    A foundational book that first systematically described role conflict and role ambiguity as a source of chronic stress.

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21. Thomas-Kilmann Conflict Mode Instrument (TKI)

    Kenneth W. Thomas, Ralph H. Kilmann (1974) — Thomas-Kilmann Conflict Mode Instrument

    A validated questionnaire that identifies which of five habitual conflict-handling styles a person uses (competing, avoiding, accommodating, compromising, collaborating).

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22. Gottman's research on marital stability/conflict

    John M. Gottman, Nan Silver (1999) — The Seven Principles for Making Marriage Work

    The culmination of decades of laboratory observation of couples (the 'Love Lab'), which identified specific communication patterns that predict divorce or marital stability.

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23. Polyvagal theory

    Stephen W. Porges (2011) — The Polyvagal Theory: Neurophysiological Foundations of Emotions, Attachment, Communication, and Self-regulation

    A theory of how the autonomic nervous system, via the vagus nerve, regulates the sense of safety, social engagement and stress responses.

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24. ACT (Acceptance and Commitment Therapy) / experiential avoidance

    Steven C. Hayes, Kirk D. Strosahl, Kelly G. Wilson (1999) — Acceptance and Commitment Therapy: An Experiential Approach to Behavior Change

    The foundational book on ACT, showing that attempts to avoid unpleasant thoughts and feelings (experiential avoidance) themselves intensify psychological suffering.

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25. Chronotype / Morningness-Eveningness Questionnaire

    James A. Horne, Olov Östberg (1976) — A Self-Assessment Questionnaire to Determine Morningness-Eveningness in Human Circadian Rhythms

    A validated questionnaire that classifies people by chronotype ('morning lark' / 'night owl') based on their circadian preferences.

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26. Ultradian rhythm research / Basic Rest-Activity Cycle

    Nathaniel Kleitman (1963) — Sleep and Wakefulness

    Kleitman was the first to propose a roughly 90-minute basic rest-activity cycle (BRAC) that operates not only during sleep but also during wakefulness.

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27. Bergen Work Addiction Scale

    Cecilie Schou Andreassen, Mark D. Griffiths, Jørn Hetland, Ståle Pallesen (2012) — Development of a work addiction scale

    A psychometrically validated 7-item scale (developed on a sample of 12,135 Norwegians) that measures signs of work addiction using a behavioral-addiction model.

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28. Financial anxiety scale

    John E. Grable, Wookjae Heo, Abed Rabbani (2014) — Financial Anxiety, Physiological Arousal, and Planning Intention

    Research shows that financial anxiety and physiological arousal have different effects on a person's willingness to seek financial planning help.

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29. Zero-sum belief research

    Shai Davidai, Martino Ongis (2019) — The politics of zero-sum thinking: The relationship between political ideology and the belief that life is a zero-sum game

    Six studies (N=3,223) show that the belief that 'one person's gain is always another's loss' systematically distorts the perception of situations and decisions.

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30. Escape theory

    Roy F. Baumeister (1991) — Escaping the Self: Alcoholism, Spirituality, Masochism, and Other Flights from the Burden of Selfhood

    Baumeister describes how alcohol, binge eating, masochism and spiritual practices can serve as ways to temporarily 'switch off' the burden of self-awareness.

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31. Narrative identity theory

    Dan P. McAdams (2001) — The Psychology of Life Stories

    A review article arguing that people create coherence and meaning in life through an internal, continually revised story about themselves.

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32. Identity theory

    Sheldon Stryker (1980) — Symbolic Interactionism: A Social Structural Version

    A classic monograph explaining how a person's multiple social identities are organized into a hierarchy of prominence (identity salience).

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33. Social rank theory

    Paul Gilbert (2001) — Evolution and Social Anxiety: The Role of Attraction, Social Competition, and Social Hierarchies

    An evolutionary model that explains social anxiety and submission as adaptive responses to one's perceived place in the social hierarchy.

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34. Emotion regulation / suppression

    James J. Gross (1998) — Antecedent- and Response-Focused Emotion Regulation: Divergent Consequences for Experience, Expression, and Physiology

    Experimentally shows that suppressing emotions (unlike cognitive reappraisal) does not reduce subjective experience but increases physiological arousal.

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35. Procrastination as emotion regulation

    Fuschia M. Sirois, Timothy A. Pychyl (2013) — Procrastination and the Priority of Short-Term Mood Regulation: Consequences for Future Self

    Shows that procrastination is primarily a failure of emotion regulation (the urge to improve one's mood right now) rather than a time-management problem.

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36. Sociotropy (cognitive model of depression)

    Aaron T. Beck, Norman Epstein, Robert Harrison, Gary Emery (1983) — Development of the Sociotropy-Autonomy Scale: A Measure of Personality Factors in Psychopathology

    Beck proposed two personality dimensions of depression risk — sociotropy (dependence on others' approval) and autonomy (dependence on one's own achievement and control).

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37. Motivational interviewing

    William R. Miller, Stephen Rollnick (1991) — Motivational Interviewing: Preparing People to Change Addictive Behavior

    The foundational book on a counseling method that strengthens a person's intrinsic motivation to change by working through ambivalence rather than applying pressure.

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38. Commitment and consistency principle

    Robert B. Cialdini (1984) — Influence: The Psychology of Persuasion

    The classic book on the six principles of persuasion, including people's drive to stay consistent with choices and statements they have already made.

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39. Attachment theory

    John Bowlby (1969) — Attachment and Loss, Vol. 1: Attachment

    The foundational work describing attachment as a biologically based system that shapes patterns of closeness and trust throughout life.

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