Deficiency and Delinquency: An Interpretation of Mental Testing — A Closer Reading

The Border Region and the Problem of Doubtful Intellects

Miner devotes considerable attention to what he calls the “border region” for both mature and immature subjects. He notes that examiners often presume delinquency implies deficiency, but he warns that this assumption can distort diagnoses. For the mature, he cites data from a random group to show how borderline scores cluster, and he observes a “present tendency among examiners” to classify such cases inconsistently. For the immature, he traces changes in how the Binet 1908 scale was interpreted over time, arguing that shifting cutoff points reflect arbitrary decisions rather than empirical discoveries. This section underscores his central claim: that the line between deficiency and normality is a statistical convenience, not a natural kind.

The Role of the Examiner and the Limits of Testing

Miner is sharply critical of half-trained examiners. He quotes an editorial by Dr. Gault that attributes dissatisfaction with mental tests to “palpable errors” made by those with only six weeks of training in a psychological clinic. He also cites a 1915 resolution by the American Psychological Association warning against diagnosis by unqualified persons. Miner endorses Binet’s own suggestion that diagnosis requires the combined experience of teachers, doctors, and psychologists. He argues that legal isolation of the feeble-minded, especially defective delinquents, should be based on a committee plan rather than a single test score. This emphasis on procedural safeguards reveals his concern that testing, without proper expertise, can do more harm than good.

Comparing Deficiency Rates Across Institutions

Miner presents comparative data on tested deficiency among delinquents, breaking down results by gender and type of institution. He examines women and girls in state versus county and city facilities, and similarly for men and boys. The figures show striking disparities: for example, rates at the Glen Farm School for Boys differ from those reported elsewhere. Miner does not take these numbers at face value; instead, he uses them to question whether the tests are measuring the same thing in different populations. He also considers the effect of special training on the mentally retarded, suggesting that educational intervention can alter test performance. This comparative approach reinforces his argument that deficiency is not a fixed trait but a label shaped by institutional context and testing practices.

Readers should approach Miner’s tables and percentages with the same critical eye he applies to the examiners he critiques. His book is less a manual for testing than a meditation on the social and statistical assumptions that make testing seem objective. Pay attention to how he distinguishes between desirable and immediately advisable social care—a distinction that reveals the gap between ideal definitions and practical decisions. Miner’s work remains a valuable case study in the early efforts to quantify human intelligence and the ethical dilemmas those efforts entailed.

I’ve always kept Miner’s old volume near, noting how he saw deficiency as a matter of degree, not kind. It reminds me of reading The Twin Hells—that earnest account of prison life. Both whisper that labels, whether “deficient” or “convict,” only hint at the quieter truth of human circumstance. The Twin Hells A Thrilling Narrative of Life in the Kansas and Missouri Penitentiaries — Key Ideas to Explore sits beside it on my shelf now, a gentle pairing of judgments softened by time.