5 Contradicted by research
Most cases of addiction and substance use disorders begin during adolescence.
"So most cases of substance use disorders or addiction begin in adolescence." (said at 0:04:05)
Large-scale epidemiological studies and meta-analyses show that the vast majority of substance use disorders (SUDs) do not begin during adolescence (defined as under age 18). A 2022 meta-analysis of 192 epidemiological studies (Solmi et al., n=708,561) found that only 15.2% of individuals with substance use disorders had an onset before age 18 (and 2.9% before age 14), with the peak age of onset occurring at 19.5 years and a median age of onset of 25 years. Similarly, data from the WHO World Mental Health Surveys found that only 15% of lifetime alcohol use disorders develop before age 18, and the National Comorbidity Survey Replication reported a median age of onset of 20 years for substance use disorders. While initial substance experimentation often occurs in adolescence, most clinical cases of addiction and substance use disorders emerge in young adulthood.
- contradicts: Lifetime prevalence and age-of-onset distributions of DSM-IV disorders in the National Com… (Archives of general psychiatry 2005) · cited 20678x in the literature
"Median age of onset is much earlier for anxiety (11 years) and impulse-control (11 years) disorders than for substance use (20 years) and mood (30 years) disorders." (abstract, results, passage verified)
pubmedfull study (doi) - contradicts: The epidemiology of alcohol use disorders cross-nationally: Findings from the World Mental… (Addictive behaviors 2020) · cited 275x in the literature
"15% of all lifetime AUD cases developed before age 18." (abstract, results, passage verified)
pubmedfull study (doi) - contradicts: Age at onset of mental disorders worldwide: large-scale meta-analysis of 192 epidemio… (Molecular psychiatry 2022) · cited 3779x in the literature
"For diagnostic blocks, the proportion of individuals with onset of disorder before the age of 14, 18, 25 and peak age were as follows: ... substance use disorders/addictive behaviours: 2.9%, 15.2%, 48.8%, 19.5 years (k = 58, median = 25, IQR = 20-41)" (abstract, results)
pubmedfull study (doi)
Childhood-onset antisocial behavior shows a male-to-female sex ratio between 2:1 and 4:1.
"The sex ratio varies, but sometimes it's two to one, sometimes it's as high as four to one." (said at 0:58:26)
The speaker claimed that the male-to-female sex ratio for childhood-onset antisocial behavior varies between 2:1 and 'as high as four to one'. However, published developmental psychopathology literature and longitudinal research show that childhood-onset (life-course persistent) antisocial behavior exhibits a much larger male preponderance, often reported between 4:1 and up to 10:1. In contrast, the narrower sex ratio cited by the speaker (~1.5:1 to 2:1) is characteristic of adolescent-onset antisocial behavior.
A subsequent study identified rare MAOA mutations in several other impulsively aggressive boys referred to a hospital.
"And later there was another group that found this ostensibly rare mutation in several other impulsively aggressive boys that had been referred to their hospital." (said at 1:08:00)
The claim that a subsequent hospital-based cohort study identified the rare Brunner syndrome MAOA point mutation (or novel functional MAOA deficiency mutations) across several other impulsively aggressive boys is contradicted by replication studies. Following the initial 1993 description by Brunner et al. in a single Dutch kindred, subsequent screening studies of aggressive, impulsive, and institutionalized males (such as 54 aggressive males in secure facilities screened by Craddock et al., 2001) failed to identify MAOA-deficiency mutations in psychiatric/hospital referrals. Complete loss-of-function MAOA mutations (Brunner syndrome) remain exceptionally rare, with only isolated kindreds/individual cases identified globally rather than a series of cases among hospital referrals.
A study on marital conflict found that after an argument, men's cortisol levels spiked and quickly returned to baseline, whereas wives' cortisol levels remained elevated for approximately 24 hours.
"And they looked at how long did men's cortisol remain elevated after an argument compared to the wives' cortisol. And it was basically like they had the fight, his spiked up and then it went down like classic Trier curve, and hers was elevated for like 24 hours afterwards." (said at 1:38:50)
Studies of marital conflict and endocrine responses (notably the classic laboratory conflict paradigms by Kiecolt-Glaser and colleagues) have found that wives often exhibit greater or more persistent neuroendocrine reactivity (such as cortisol and catecholamines) in response to negative marital interactions or spousal withdrawal compared to husbands. However, acute cortisol responses to an argument follow standard physiological recovery kinetics over hours rather than remaining elevated for 24 hours. In these studies, cortisol was typically measured over a 30-minute conflict discussion, short recovery periods (e.g., 15-60 minutes), or pooled across daytime hours (8:00 a.m. to 10:00 p.m.), not showing a continuous 24-hour post-conflict elevation in wives.
- contradicts: Marital conflict and endocrine function: are men really more physiologically affected than… (Journal of consulting and clinical psychology 1996) · cited 196x in the literature
"Blood samples acquired hourly from 8:00 a.m. through 10:00 p.m. were combined to provide composite daytime values for 3 stress hormones -- epinephrine (EPI), norepinephrine (NEPI), and cortisol -- and 3 related hormones (ACTH, growth hormone, and prolactin)... For wives, higher probabilities of husband's withdrawal in response to wife's negative behavior were associated with higher NEPI and cortisol levels... Husbands' endocrine data were not associated with behavioral data." (abstract, results, passage verified)
pubmedfull study (doi) - contradicts: Marital conflict in older adults: endocrinological and immunological correlates. (Psychosomatic medicine 1997) · cited 282x in the literature
"for hormone analyses, five blood samples were drawn during a 30-minute conflict discussion and a 15-minute recovery session... Among wives, escalation of negative behavior during conflict and marital satisfaction showed strong relationships to endocrine changes, accounting for 16% to 21% of the variance in the rates of change of cortisol, adrenocorticotropic hormone (ACTH), and norepinephrine (but not epinephrine). In contrast, husbands' endocrine data did not show significant relationships with negative behavior or marital quality." (abstract, results)
pubmedfull study (doi)
The heritability of personality traits continues to increase with age until around age 30.
"Heritability of personality continues to increase until around age 30." (said at 2:34:14)
The claim confuses personality traits with general cognitive ability (intelligence). In behavioral genetics, the heritability of intelligence is well-documented to increase from childhood through young adulthood (reaching ~70–80% around age 30, known as the Wilson effect). In contrast, twin and lifespan studies of personality traits show that personality heritability remains roughly stable (~40–50%) or decreases across adulthood, as environmental and life experiences account for an increasing proportion of variance across the lifespan.
Unverified means no publication matching the claim was located; it does not prove the claim false. Spotted an error? See the corrections policy - disputes from the people quoted are prioritized.