Evidence for Assertions #

Every substantive claim on the Assertions page is checked against current research. Here is each claim, how well today’s evidence supports it, and the sources. The full, de-duplicated source list lives on the references page.

Supported · moderate evidence — Repeating positive identity affirmations (e.g. ‘I am a lovable person’) can backfire for people with low self-esteem, leaving them feeling worse than saying nothing, while helping people who already have high self-esteem.

Wood, Perunovic & Lee (2009) directly demonstrated this self-esteem moderation: the affirmation helped high-self-esteem participants but left low-self-esteem participants in a worse mood and with lower state self-esteem than controls. The finding is widely cited and consistent with the broader self-verification literature, though the original study has modest samples and is the principal direct demonstration.

Sources: Wood, Perunovic & Lee (2009), Positive Self-Statements: Power for Some, Peril for Others, Psychological Science — https://doi.org/10.1111/j.1467-9280.2009.02370.x · full reference ›

Supported · strong evidence — Forming a specific ‘when situation X occurs, I will do Y’ plan (an implementation intention) substantially increases follow-through on goals compared with holding the goal in the abstract.

Gollwitzer & Sheeran’s meta-analysis of 94 studies found a medium-to-large effect (d ~ 0.65) of implementation intentions on goal attainment over and above mere goal intentions. The effect is robust and has been replicated across many domains, though effect sizes vary by behaviour type and difficulty.

Sources: Gollwitzer & Sheeran (2006), Implementation Intentions and Goal Achievement: A Meta-Analysis of Effects and Processes, Advances in Experimental Social Psychology — https://doi.org/10.1016/S0065-2601(06)38002-1 · full reference ›

Supported · moderate evidence — Self-talk framed around concrete, controllable behaviours and processes is more effective and less likely to backfire than self-talk framed around fixed identity traits.

This follows from the self-statements literature (a believable, specific statement avoids the discrepancy that makes grand identity claims backfire) and converges with sports-psychology findings that instructional/process self-talk reliably aids performance; the directional claim is well supported, the precise comparison of trait-vs-behaviour framing less directly tested in a single study.

Sources: Wood, Perunovic & Lee (2009), Positive Self-Statements: Power for Some, Peril for Others, Psychological Science — https://doi.org/10.1111/j.1467-9280.2009.02370.x · Hatzigeorgiadis, Zourbanos, Galanis & Theodorakis (2011), Self-Talk and Sports Performance: A Meta-Analysis, Perspectives on Psychological Science — https://doi.org/10.1177/1745691611413136 · full reference ›

Supported · strong evidence — Replacing harsh, sweeping negative self-talk with fairer, more realistic statements is an effective way to improve internal dialogue (a core cognitive-behavioural technique).

Cognitive restructuring—identifying and replacing distorted, negative automatic thoughts with more balanced ones—is a central, well-validated component of cognitive behavioural therapy, supported by large meta-analyses across anxiety and mood problems. The page’s advice to substitute believable, fairer self-talk for catastrophic self-talk reflects mainstream CBT.

Sources: Hofmann, Asnaani, Vonk, Sawyer & Fang (2012), The Efficacy of Cognitive Behavioral Therapy: A Review of Meta-analyses, Cognitive Therapy and Research — https://doi.org/10.1007/s10608-012-9476-1 · full reference ›

Supported · moderate evidence — Affirmations and self-talk support behaviour change but do not substitute for the actions themselves; the statements help maintain supportive internal dialogue while the person takes action.

Consistent with goal-striving research: intentions and self-statements predict outcomes only when paired with concrete action plans and behaviour (the intention-behaviour gap), which implementation intentions help bridge. Verbal self-statements alone, without action, are not shown to change real-world outcomes.

Supported · moderate evidence — Specific, believable self-statements that the person can accept are more useful than grandiose statements that conflict sharply with current self-belief.

Wood et al. interpret the backfire effect via self-verification and discrepancy: statements far from one’s self-view trigger counter-arguing. The recommendation to keep statements believable (within latitude of acceptance) follows directly and is consistent with persuasion and self-affirmation research, though framed here as practical guidance rather than a single tested protocol.

Sources: Wood, Perunovic & Lee (2009), Positive Self-Statements: Power for Some, Peril for Others, Psychological Science — https://doi.org/10.1111/j.1467-9280.2009.02370.x · full reference ›