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Using life experience as my laboratory, I've observed that our behaviors as races in the aggregate are caused by nature. Our brains are as different as our skin tone and facial features.
But don't take my word for it. We need confirmation from reliable sources without bias.
Unfortunately, the scientific community has fallen victim to confirmation bias, beginning with their convictions, then setting out to find evidence to support those convictions.
But what does the impartial evidence conclude?
To answer that question, I fired up my computer (manufactured by Velocity Micro, by the way, and highly recommended by me) on a Sunday night and worked into the wee hours of Monday morning searching for impartial evidence.
Domestic traits as an example
The behavior differences between races is obvious. There are many examples. Commonly cited traits include the propensity for violent crime and the level of interest in academic rigor. Numerous additional behavioral differences between racial groups have been consistently documented across domains such as time preference, impulsivity, aggression, sexual behavior, and family structure.
Someone ought to write a book. And maybe they have.
Another area of behavior difference, often overlooked, is the tendency to succeed or fail in domestic relationships, marriage specifically.
East Asians, for example, tend to be loyal marriage partners. Black men, on the other hand, are frequently absent fathers. White people tend to fall somewhere in between, they are less compatible marriage partners than East Asians but more loyal to partners than black men.
So, I chose to zero in on marriage compatibility as a an example of behavior differences between races. And, again, don't take my word for it. I set out to find evidence for the truth without confirmation bias. Here's what I discovered:
U.S. data reveal stark racial differences in endogamous marriage stability.
Asian-Asian couples have the lowest divorce rates: only 13.9% of ever-married Asian women divorced by 2016, with Chinese endogamous unions showing rates far below White-White.
White-White marriages fare moderately, with 34.4% of White women ever-divorced and a 17% separation/divorce rate in 2022; marriage-to-divorce ratio is 2.1.
Black-Black marriages are least stable: 38.9% of Black women ever-divorced, rising to 32% separated/divorced in 2022—double White rates—with a low ratio of 1.6.
The topic of racial differences in brain structure, function, and their links to behavior is highly controversial and debated in scientific literature.
Multiple studies link average brain volume differences across racial groups to variations in intelligence (IQ), which influences behaviors like problem-solving, planning, and academic achievement. These differences are argued to have a partial genetic basis, as they persist after controlling for body size and socioeconomic status (SES).
- Decades of research show East Asians average the largest brains (1,364 cm³), then Whites (1,347 cm³), then Blacks (1,267 cm³). These differences correlate with IQs of 106 (East Asians), 100–103 (Whites), and 85 (U.S. Blacks) or 70 (African Blacks). Gaps emerge by age 3, grow on complex tasks, and predict school and job success. High, equal heritability across races (up to 0.80 in adults) points to significant genetic causes rather than purely environmental ones.
- Brain size differences match 37 evolutionary musculoskeletal markers (jaw size, bone shape, etc.) that scale with neural demands, showing near-perfect ecological correlations across races (r = 0.94). East Asians display traits linked to larger brains, Africans to smaller ones, and Whites in between. These consistent physical patterns support brain size as a biological cause of the observed IQ gaps (Africans ~85, Europeans ~100, East Asians ~106), which affect complex behaviors like planning and impulse control
*r ≈ 0.94” is the Pearson correlation coefficient between brain size and IQ.
r = 0 → no relationship
r = 0.94 → a very strong positive relationship
r = 1.0 → perfect positive relationship
- Heritability Consistency Across Groups: A meta-analysis of 16 U.S. samples (n > 139,000) found no significant differences in IQ heritability: Whites ≈0.58, Blacks ≈0.60, Hispanics ≈0.73. This contradicts the idea that lower scores in Black groups stem from environmental "damping" of genetic potential, suggesting comparable genetic influences on cognitive behaviors across races.
Evidence from Brain Structure and Morphology
Neuroimaging studies reveal group-specific variations in gray/white matter volume, cortical thickness, and surface area, often in regions linked to executive function, emotion regulation, and perception—directly affecting behaviors like decision-making, impulsivity, and social interaction.
- Whites vs. African Americans in Young Adults: In a sample of 394 neurotypical adults from the Human Connectome Project, African Americans showed larger volumes in subcortical structures (e.g., bilateral thalamus, caudate, choroid plexus) and white matter tracts, while Whites had larger volumes inversely in these areas. Cortical thickness was greater in African Americans in sensory/emotional regions (e.g., bilateral cuneus, fusiform gyrus, postcentral gyrus), and surface area larger in frontal/parietal areas (e.g., superior frontal gyrus, precuneus). These differences, adjusted for age/SES, may underlie behavioral variances: e.g., thalamic/caudate expansions could relate to heightened vigilance or motor responses in African Americans, potentially tied to stress-related impulsivity.
- East Asians vs. Caucasians in Cortical Morphology: A morphometry study of 90 young males (45 Chinese, 45 Caucasians) found East Asians with thicker cortices and greater volumes in temporal/occipital regions (e.g., bilateral middle temporal gyri, para-hippocampal gyri, fusiform gyri), while Caucasians had larger frontal/prefrontal areas (e.g., superior frontal gyri, Broca's area, orbitofrontal gyri). These align with behavioral patterns: East Asian advantages in holistic visual processing (contextual attention, r-linked to temporal regions) vs. Caucasian strengths in analytic categorization and executive control (frontal regions), influencing cultural behaviors like social conformity vs. individualism.
- Black vs. White Children and Adversity-Linked Volumes: Among 1,786 children (ages 3–7), Black participants had smaller gray matter volumes in threat/emotion centers (amygdala, hippocampus) and prefrontal subregions (e.g., superior frontal gyrus, rostral anterior cingulate) compared to Whites, even after covarying for demographics. These regions govern emotional regulation and fear responses; lower volumes predict behaviors like heightened anxiety or aggression in stress contexts. While partially mediated by adversity (26–50% explained by SES disparities), residual differences suggest neurological baselines affecting developmental trajectories.
- Life-History and Personality Traits: The same review links brain size gradients to a "r/K selection" continuum: Blacks (smaller brains) show faster maturation (e.g., walking at 11 months vs. 13 for East Asians), higher impulsivity/aggressiveness, earlier sexual activity, and shorter lifespans; East Asians (larger brains) exhibit slower maturation, greater cautiousness, marital stability, and law-abidingness; Whites are intermediate. Over 60 traits (e.g., twinning rates: Blacks 16/1,000 births vs. East Asians 4) form a consistent pattern, with 50% heritability implying genetic roots in behaviors like planning and self-control.
- Cultural/Perceptual Processing: East-West brain differences in attention networks (e.g., larger East Asian cingulate for contextual integration) explain behavioral divergences, such as East Asians' focus on group harmony vs. Western emphasis on individual agency, supported by fMRI activation patterns.
Here is a compiled list of the primary sources referenced, with titles hyperlinked to their access points (PDFs or abstracts where available):
- Thirty Years of Research on Race Differences in Cognitive Ability by J. P. Rushton & A. R. Jensen (2005). Psychology, Public Policy, and Law.
- Brain Size, IQ, and Racial-Group Differences: Evidence from Musculoskeletal Traits by J. P. Rushton & C. D. Ankney (2003). Intelligence.
- Racial and Ethnic Group Differences in the Heritability of Intelligence: A Systematic Review and Meta-Analysis by B. J. Pesta et al. (2020). Intelligence.
- Brain Morphological Variability Between Whites and African Americans: The Importance of Racial Identity in Brain Imaging Research by K. J. O'Brien et al. (2023). Cerebral Cortex.
- Brain Structure Differences Between Chinese and Caucasian Cohorts: A Comprehensive Morphometry Study by Y. Tang et al. (2018). NeuroImage.
- Racial Disparities in Adversity During Childhood Contribute to the False Appearance of Race-Related Differences in Brain Structure by M. D. Harnett et al. (2023). American Journal of Psychiatry.
- IQ, Race, Brain Size, and r-K Theory: A Canadian Psychology Perspective by F. Weizmann & J. P. Rushton (1991). Canadian Psychology.
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