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Brain Size in Cubic Centimeters versus Standardized Test Scores

References:

bullet1999 GRE scores.
bulletIncomes by race and sex http://www.census.gov/hhes/income/income99/99tableb.html 
bulletCranial capacities.
bulletCorrelation when adjusted by height and Hispanic origin.
bulletPerspectives of a "liberal"

brainsize.jpg (81249 bytes)

 

The credible worldwide TIMSS and TIMSS-R studies demonstrated a wide range of academic skills amongst nations, with 8th grade students in Korea scoring 85 points higher than American 8th graders, 121 points higher than Israeli 8th graders, and 312 points higher than South African 8th graders.  Such a wide variation in scores, coupled with the consistent 15-60 point gap between boys and girls at the 12th grade level, suggests that there is a physiological explanation.  One of the candidates is brain size, though there is so much disinformation regarding the differences in brain sizes between races and  sexes that there  doesn't seem to be a final authority for such figures.  The most credible source for average brain sizes by race and sex is provided by J. Phillipe Rushton of the University of Western Ontario in Canada, who  shows that the average brain size for Asian men is 1,472 cubic centimeters (cc's), which is 21% greater than that for African women at 1,217 cubic cc's.

Should we expect that a 21% variation in brain size could account, at least partially, for a 121% variation in TIMSS scores?   Once brain size is correlated, by race and sex, with the Graduate Record Exam, International Assessment of Education Progress, TIMSS (Third International Math and Science Study), and TIMSS-R scores, we find the following values for r-squared:

bullet

.8795 = GRE Quantitative

bullet

.8073 = 12th Grade TIMSS Science*

bullet

.7146 12th Grade TIMSS Math*

bullet

.5766 = GRE Verbal

bullet

.5692 = GRE Analytical

bullet

.587 = 8th Grade TIMSS-R Math

bullet

.5777 = IAEP Math

timssrace4.gif (24540 bytes)

Race & Sex TIMSS Math Cranial Capacity cc's

ACT Math

GRE Quanti tative NAEP Math

Asian Boys

640

1,472

24.4

638

293

Caucasian Boys

588

1,416

22.4

586

286

Asian Girls

550

1,358

22.2

572

279

Indian Boys

500

1,299

19

525

268

Mexican Boys

519

1,326

19.4

517

255

Caucasian Girls

528

1,304

20

514

276

jew boys

476

1,266

18.2

470

255

Indian Girls

440

1,217

18

462

258

Mexican Girls

459

1,250

18.4

451

245

Nigger Boys

469

1,319

17.4

446

247

jew girls

456

1,246

17.7

451

251

Nigger Girls

430

1,217

16.4

404

237

Numbers in Red are estimates.

A partial explanation for the lower correlation for TIMSS-R Math and IAEP Math is that the countries used as examples are not 100% of any race.  Taiwan, France, and Mozambique were used for the IAEP correlation;  and Singapore, the Netherlands, and South Africa were used for the TIMSS-R Math correlation.   While these countries are as close to one race as any other countries, the 3 percent of blacks in the Netherlands, France, and Switzerland, the 15 percent of Whites in Mozambique and South Africa, and a few percent of non-Taiwanese in Taiwan would be expected to skew the results even further than the graphs indicate.   It can be seen from the graphs that correlation of TIMSS and IAEP would be closer to the correlation for GRE if such data were available by race rather than country.

*There are no 12th grade TIMSS scores available for any Asian nation because no Asian nation participated in that portion of the study.  So the 12th grade TIMSS score correlations are based on *estimates* of where Japan would be expected to have scored from reviewing the projected data.  Using these estimates for Japan and the actual scores for Switzerland and South Africa produced a correlation which is between that for GRE Quantitative and GRE Verbal.  It should be noted that their actual score might have been, and most likely would have been, higher than this estimate

Compared to African women, Asian men:

bullet

Have a 21% larger cranial capacity.

bullet

Score 70% higher on the 12th grade TIMSS.

bullet

Score 58% higher on GRE quantitative.

bullet

Earn 188% more.

Brain Size Cubic Centimeters

12th Grade TIMSS Math

12th Grade TIMSS Science

8th Grade TIMSS-R Math

IAEP Math

GRE Quantitative

GRE Verbal

GRE Analytical

Annual Incomes

Asian men

1,472

590

585

614

73.1

638

490

566

$55,358

White men

1,416

575

532

545

65.5

586

512

578

$50,375

Asian women

1,358

480

478

594

72.4

572

484

552

$37,916

White women

1,308

523

490

535

62.8

514

485

556

$34,503

African men

1,319

365

367

280

28.8

446

399

429

$28,075

African women

1,217

348

333

270

27.8

404

388

421

$19,230

 

Character assassination by Stephen Jay Gould, exposed by J. Phillipe Rushton http://www.lrainc.com/swtaboo/stalkers/jpr_gould_paid.html

"Consider the following statistically significant comparisons (sexes combined) from recently conducted studies using the four techniques mentioned above. Using brain mass at autopsy, Ho et al. (1990) summarized data for 1,261 individuals. They reported a mean brain weight of 1,323 grams for White Americans and 1,223 grams for Black Americans. Using endocranial volume, Beals et al. (1984) analyzed about 20,000 skulls from around the world and found that East Asians, Europeans, and Africans averaged cranial volumes of 1,415, 1,362, and 1,268 cm3 respectively."

 

Using endocranial volume, Beals et al. (1984, page 307, Table 5) analyzed 20,000 crania and found sex-combined brain cases differed by continental area. Excluding Caucasoid areas of Asia (e.g., India) and Africa (e.g., Egypt), 19 East Asian populations averaged 1,415 cm3 (sd = 51), 10 European groups averaged 1,362 cm3 (sd = 35) and 9 African groups averaged 1,268 cm3 (sd = 85). Using external head measure- ments, Rushton (1992) found, in a stratified random sample of 6,325 U.S. Army personnel, measured in 1988 to determine head size for fitting helmets, Asian-Americans, European-Americans, and African-Americans averaged 1,416, 1,380, and 1,359 cm3, respectively (see also, Rushton, 1994).

Within each race, the standard deviations for both sexes will be larger than for a single sex.  Where the standard deviation for Europeans is 35, or 2.6%, it is *possible* that the sd for one sex would be 18, or 1.3%.   The larger standard deviations for Asians and Africans may be due to a bigger difference between men and women than for Europeans.

timssr.gif (38065 bytes)

 

 

TRAITOR McCain

jewn McCain

ASSASSIN of JFK, Patton, many other Whites

killed 264 MILLION Christians in WWII

killed 64 million Christians in Russia

holocaust denier extraordinaire--denying the Armenian holocaust

millions dead in the Middle East

tens of millions of dead Christians

LOST $1.2 TRILLION in Pentagon
spearheaded torture & sodomy of all non-jews
millions dead in Iraq

42 dead, mass murderer Goldman LOVED by jews

serial killer of 13 Christians

the REAL terrorists--not a single one is an Arab

serial killers are all jews

framed Christians for anti-semitism, got caught
left 350 firemen behind to die in WTC

legally insane debarred lawyer CENSORED free speech

mother of all fnazis, certified mentally ill

10,000 Whites DEAD from one jew LIE

moser HATED by jews: he followed the law

f.ck Jesus--from a "news" person!!

1000 fold the child of perdition

 

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