Justin’s Notes

The Regress of Bias Detection

2026-08-11 · AI-generated insight

The Morton affair, as Warne recounts it, has the structure of an infinite regress. Gould accused Morton of unconsciously fudging skull measurements to fit racist priors. Decades later, anthropologists accused Gould of manipulating the data to fit his priors. Then came a third wave — Weisberg defending Gould, Mitchell defending Morton's numbers, and Kaplan making the most interesting move of all: arguing that Morton's interpretations were flawed but that Gould was wrong to think he could discern Morton's motivations at all. Each layer of bias-hunting generated a new layer of suspected bias. There is no stable floor.

Kaplan's point suggests why: motive attribution in science is nearly unfalsifiable. You can audit a dataset; you cannot audit a soul. When a field's central dispute becomes 'whose prejudice contaminated the numbers,' the debate detaches from anything that could settle it, and every participant's conclusions become evidence — to their opponents — of their corruption.

The Winegard and Carl note reads, in this light, as an attempted exit from the regress. Their case for population divergence never mentions anyone's character. It runs entirely on mechanism: dispersal, differential selection pressures, geographic barriers to gene flow, drift. These are claims about processes whose predictions can be checked against genomic data regardless of who proposes them or why. Where Morton and Gould fought over what skull measurements revealed about the measurer, the mechanistic framing tries to make the researcher's motives irrelevant to the argument's validity.

But the Gould episode should temper confidence in that escape. Gould, too, presented himself as the dispassionate one — the statistician correcting a biased predecessor — and factor analysis, per Carroll, was a formal machinery he still managed to misread in a motivated direction. Mechanism and mathematics narrow the space for bias; they don't eliminate it. The real lesson of the regress may be procedural rather than rhetorical: the only bias-detection that terminates is the kind Morton inadvertently enabled — leaving your raw data public enough that your accusers, and their accusers, can keep re-measuring the skulls.

Woven from these notes

Many scholars have criticized The Mismeasure of Man periodically throughout its 38-year history. For example, James T. Sanders stated that Gould’s attempt to link his argument to anti-racism was a ploy to smear intelligence scholars and Gould’s enemies as evil people. Arthur Jensen argued in 1982 that Gould misrepresented Jensen’s ideas and often demolished strawmen that no intelligence scholar believes, including the boogeyman of “biological determinism.” John Carroll showed that Gould understood neither the purpose nor interpretation of factor analysis (a statistical procedure often used to evaluate data from psychological tests) and that Gould’s attacks on factor analysis do nothing to alter the importance of intelligence tests, nor the mass of evidence—impossible to dispute—that they predict real-life outcomes. Most criticism of The Mismeasure of Man was confined to the recherché world of psychologists who study intelligence. However, a new debate opened up in 2011 when a team of anthropologists argued that Gould’s analysis of the data on cranium measurements from 19th century scientist Samuel George Morton was flawed. Gould cast Morton as a racist who fudged his data to match his beliefs about white racial superiority because of a supposed larger skull capacity. Instead, the anthropologists argued, it was Gould who manipulated the data to support his biases. This ignited a series of follow-up articles in the scholarly literature by authors taking a variety of positions regarding Morton’s data and Gould’s interpretations. Weisberg believed that the re-analysis was flawed and Gould was mostly correct. Kaplan and his colleagues claimed that Morton’s interpretations were flawed, but that Gould was incorrect in believing that he could discern Morton’s actions and motivations. Finally, Mitchell believed that Morton’s data were accurate and that the interpretations were colored by the racism of the era, but the claim that Morton subtly manipulated the data was a fiction created by Gould.
— Russell T. Warne The Mismeasurements of Stephen Jay Gould

A more plausible conception of race, one that is consistent with how careful philosophers and geneticists use the term, recognises that: When humans began leaving Africa around 75,000 years ago, they dispersed across a much greater range of environments than they had previously inhabited. The humans that settled in different geographic regions subsequently came under different selection pressures (e.g. temperature, seasonality, altitude). Natural barriers such as oceans (e.g. the Atlantic), deserts (e.g. the Sahara) and mountain ranges (e.g. the Himalayas) impeded gene flow between different populations for substantial periods of time. When there is limited gene flow between populations that have come under different selection pressures, we would expect them to gradually diverge from one another over via the processes of genetic drift and natural selection.

— Bo Winegard, Noah Carl Superior: The Return of Race Science—A Review