Appendix C: Claim Verdict Reference

Every major claim evaluated in this book, with its evidence rating, chapter reference, and one-line summary.

Part I: How Psychology Goes Viral (Ch. 1–5)

Claim	Rating	Ch	Summary
Personality quizzes reveal meaningful truths	⚠️	1	Some assessments (Big Five) are valid; most popular quizzes exploit the Barnum effect
The Barnum effect is real	✅	1	One of the most replicated findings in psychology
The marshmallow test proves self-control predicts success	⚠️	2	Original correlations modest; largely explained by SES in 2018 replication
Power posing changes hormones and confidence	❌	2	Hormonal effects failed to replicate; co-author retracted support
Press releases accurately represent research	❌	2	40% contain exaggerated claims (Sumner et al., 2014)
Published findings in top journals are reliable	❌	3	OSC 2015: only 36% replicated
Ego depletion (willpower as limited resource)	❌	3	Multi-lab RRR: d = 0.04
Stanford Prison Experiment proves situations override character	❌	3	Methodologically compromised: demand effects, coaching, small sample
Psychology is less trustworthy after the crisis	❌	3	Reforms make it MORE trustworthy
You can evaluate psychology claims with a framework	✅	4	Critical thinking instruction produces moderate improvements
Self-help industry size validates its effectiveness	❌	5	Market size reflects demand, not efficacy

Part II: Personality and Identity (Ch. 6–10)

Claim	Rating	Ch	Summary
People are either introverts or extroverts	⚠️	6	Continuous dimension; most are ambiverts
Introversion = drained by social interaction	⚠️	6	Not how Big Five defines it; conflates with social anxiety
Introversion is fixed and innate	⚠️	6	Partially heritable but changes over lifespan
MBTI is scientifically valid	❌	7	Poor reliability, no type structure, no predictive validity
Enneagram has scientific basis	❌	7	No factor structure, no psychometric support
Big Five is a valid personality model	✅	7	Replicated 50+ cultures, predicts outcomes
Narcissism is extremely common	⚠️	8	NPD: 1–6%. Pop usage massively over-applies the label
There is a narcissism epidemic	🔬	8	Competing datasets; Twenge vs. Trzesniewski
Attachment style is fixed from infancy	⚠️	9	Moderately stable but ~25–30% change classification
Online attachment quizzes are accurate	❌	9	Not validated instruments
"Empath" is a recognized psychological trait	❌	10	Not a clinical term in any validated model
Psychopath and sociopath are distinct diagnoses	❌	10	Both fall under ASPD in DSM-5
HSP is a well-established clinical category	⚠️	10	Some evidence but overlaps with neuroticism/introversion

Part III: Brain and Cognition (Ch. 11–15)

Claim	Rating	Ch	Summary
We use only 10% of our brains	❌	11	All evidence contradicts this
People are left-brained or right-brained	❌	11	No hemispheric dominance in 1,011 brain scans
Brain training apps increase intelligence	❌	11	No far transfer; FTC fined Lumosity
Mozart makes babies smarter	❌	11	Original finding was small, temporary, in adults
Learning styles matching improves learning	❌	12	Meshing hypothesis fails in rigorous tests
Retrieval practice improves learning	✅	12	One of the most robust findings in learning science
Dopamine is the "pleasure chemical"	⚠️	13	Prediction, motivation, learning, motor control — not primarily pleasure
Dopamine detox resets your brain	❌	13	Can't "detox" from a continuously produced neurotransmitter
Serotonin is the "happiness chemical"	⚠️	13	Multi-function; 95% in gut
Multitasking reduces productivity	✅	14	Hundreds of studies; up to 40% loss
Flow can be reliably triggered	⚠️	14	Real but probabilistic, not hackable
Attention spans are 8 seconds	❌	14	No primary source; fabricated statistic
Humans are fundamentally irrational (blanket claim)	⚠️	15	Real biases exist; many are adaptive heuristics
Social priming reliably changes behavior	❌	15	Multiple high-profile replication failures
Confirmation bias is real	✅	15	One of the most robust findings in psychology

Part IV: Mental Health and Therapy (Ch. 16–21)

Claim	Rating	Ch	Summary
Depression rates are genuinely higher	🔬	16	Multiple factors; proportions debated
Social media is the primary cause of teen depression	⚠️	16	Association small (r ≈ 0.10–0.15); one factor among many
Depression is caused by low serotonin	⚠️	17	Serotonin hypothesis not supported (Moncrieff, 2022)
Antidepressants don't work	❌	17	They do (Cipriani, 2018); the mechanism is complex
Therapy is effective for most conditions	✅	18	Robust meta-analytic evidence
All therapies are equally effective	⚠️	18	Mostly true generally; breaks down for OCD, PTSD, BPD
The therapist matters more than the approach	✅	18	Therapist effects ~5–8x larger than approach effects
Most people who experience adversity develop PTSD	❌	19	Resilience is the norm (~6–9% develop PTSD)
Trauma is stored in the body (literally)	⚠️	19	Useful metaphor; not a literal mechanism
Intergenerational trauma is epigenetically transmitted	🔬	19	Mouse evidence; human evidence preliminary
Trigger warnings reduce distress	❌	20	No reduction; may increase anticipatory anxiety
Social media causes teen depression (causal claim)	🔬	21	Genuine scientific disagreement; unresolved

Part V: Relationships and Attraction (Ch. 22–25)

Claim	Rating	Ch	Summary
Love language matching improves relationships	❌	22	Total loving behavior matters; matching doesn't
Five Love Languages is based on research	❌	22	Based on pastoral observation, not research
Gottman's 5:1 ratio predicts stability	✅	22	Robust, replicated
Contempt is the strongest divorce predictor	✅	22	Consistent across Gottman's longitudinal studies
Opposites attract	❌	23	Similarity predicts attraction; complementarity doesn't
36 questions make you fall in love	⚠️	23	Self-disclosure → closeness (supported); → love (not established)
Gaslighting is common in relationships	⚠️	24	Genuine gaslighting exists; term now means any disagreement
Love bombing is always manipulation	⚠️	24	Can't distinguish from enthusiasm without seeing the pattern
You can't change your partner	⚠️	25	Can't coerce; can support growth (Michelangelo effect)
Relationships shouldn't require work	❌	25	All long-term relationships require maintenance

Part VI: Performance and Self-Improvement (Ch. 26–30)

Claim	Rating	Ch	Summary
Growth mindset significantly improves performance	⚠️	26	Very small effects (d = 0.03–0.10)
Grit predicts success better than talent	⚠️	27	Grit ≈ conscientiousness; IQ is a stronger predictor
Willpower is depleted with use (ego depletion)	❌	27	Multi-lab replication: d = 0.04
10,000 hours produces mastery	❌	27	Average, not threshold; practice explains 1–26% of variance
21 days to form a habit	❌	28	18–254 days (median 66)
Implementation intentions help behavior change	✅	28	Meta-analytic d = 0.65
Environment design beats willpower	✅	28	Stimulus control has evidence; ego depletion doesn't
Law of Attraction (thoughts attract events)	❌	29	No mechanism, no evidence; magical thinking
Positive visualization increases motivation	❌	29	Decreases it (Oettingen)
Mental contrasting (WOOP) improves outcomes	✅	29	Multiple RCTs
Affirmations boost self-esteem	⚠️	29	Help high self-esteem; backfire for low
Exercise improves mood, cognition, health	✅	30	Strongest evidence of any lifestyle intervention
Waking early is essential for success	❌	30	Chronotype is ~50% heritable

Part VII: Parenting and Development (Ch. 31–33)

Claim	Rating	Ch	Summary
Helicopter parenting produces anxious children	⚠️	31	Modest effects; many other factors matter more
Parenting is the most important developmental factor	❌	31	Genetics, SES, peers also crucial
Screen time damages brain development	🔬	32	Correlational, small, uncertain significance
Content matters more than screen time	✅	32	Educational content → positive outcomes
Screens before bed disrupt sleep	✅	32	Strong evidence (blue light → melatonin suppression)
IQ is a valid measure of cognitive ability	✅	33	Real, predictive, but not comprehensive
Multiple intelligences is well-supported	❌	33	No factor structure; g factor contradicts it

Part VIII: The Dark Side (Ch. 34–36)

Claim	Rating	Ch	Summary
You can detect lies from body language	❌	34	Average accuracy: 54% (barely above chance)
Trained professionals detect lies well	❌	34	Police: ~55% accuracy
Criminal profiling is scientifically validated	❌	35	Profilers not more accurate than non-profilers
Most crime reflects individual pathology	❌	35	Most crime is situational, not dispositional
NLP is scientifically validated	❌	36	No evidence across systematic reviews
Subliminal messages influence complex behavior	❌	36	Founding study was fabricated; no real-world evidence
Cialdini's influence principles are well-supported	✅	36	Reciprocity, social proof, etc. — well-replicated

Part IX: Becoming a Better Consumer (Ch. 37–40)

Claim	Rating	Ch	Summary
Bestselling self-help is evidence-based	❌	37	Popularity ≠ validity
Evidence-based self-help exists	✅	37	Burns, Gottman, Oettingen, etc.
Social media therapy = real therapy	❌	38	General psychoeducation, not individualized treatment
Social media has reduced mental health stigma	✅	38	Real and important benefit
Psychology knows very little	❌	39	CBT, Big Five, cognitive biases, exercise — well-established
Pop psychology accurately represents the science	❌	39	Most pop psych is oversimplified

Summary Statistics

Rating	Count	Percentage
✅ SUPPORTED	~22	~28%
⚠️ OVERSIMPLIFIED	~27	~35%
❌ DEBUNKED	~24	~31%
🔬 UNRESOLVED	~5	~6%

The most common rating is ⚠️ OVERSIMPLIFIED — confirming that the most dangerous pop psychology claims are not the obviously false ones but the ones with a kernel of truth that has been distorted.