Aporia Research Round-Up

A list of the most interesting academic and popular articles shared in our network.

Welcome to the Aporia Research Roundup. Every Monday (at 7am New York, 12pm London), we compile the most interesting studies and articles being shared in our network.

The first three links are always free, but we put our favourites (including the less politically correct ones) behind a paywall and the email only goes out to paid supporters.

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The Guardian uses selective polling on campus free speech. Responding to a recent survey that found 86% of English university students feel free to express themselves during their studies, Noah Carl argues that the question used was unsatisfactory and that when you ask students more satisfactory questions you find substantially higher levels of self-censorship. 

Thirty years of research on race differences in cognitive ability. In a classic article from 2005, Philippe Rushton and Arthur Jensen compare the environmentalist and hereditarian models of the black-white IQ gap with respect to ten categories of evidence. They argue there is strong support for a genetic contribution to the gap on the order of 50%.

Eleven years of student replication projects provide evidence on the correlates of replicability in psychology. Veronic Boyce and colleagues analyse a new dataset of 176 replications carried out by psychology graduate students. They find that only 49% of replications were successful, with replication effect sizes being substantially smaller than original effect sizes. 

Relationship between replication effect size and effect size in the original study.