In this episode, I sit down with clinical psychologist Dr. Jay Joseph to discuss the issue of genetic research in IQ, personality, and psychiatric disorders—particularly in the context of the thirtieth anniversary of the publication of "The Bell Curve." While twin studies are exalted by behavioral geneticists as the gold standard research that definitively settles the so-called nature-nurture debate, our conversation explores a variety of problems with such claims. Dr. Joseph offers a strong critique of twin study methodologies and assumptions, and urges a very serious and thoughtful reconsideration of many of the field’s findings in light of psychology’s replication crisis. We discuss the so-called “missing heritability problem” posed by more modern methods of evaluating the genetic influence on IQ and personality, the relationship between ongoing genetic research and big pharma, and why he believes the findings of “The Bell Curve” fail to hold up under scrutiny thirty years later.
Jay Joseph, Psy.D. is a clinical psychologist practicing in the San Francisco Bay Area. He has written critically about genetic research in the social and behavioral sciences continuously since the late 1990s, and is critical of medical models of human psychological distress and dysfunction. He is the author of four books, most recently Schizophrenia and Genetics: The End of an Illusion (2023). A complete list of his books, book chapters, and peer-reviewed articles can be found on his website: www.jayjoseph.net. Many of his online articles can be found on the Mad in America website: www.madinamerica.com
The Bell Curve at 30: A Closer Look at the Within- and Between-Group IQ Genetic Evidence: https://osf.io/preprints/psyarxiv/jz7ku 5:30: Revisiting problematic assumptions and methodologies in twin studies, focusing on critiques of "The Bell Curve" on its thirtieth anniversary.
10:30: Examining the impact of environmental factors on twins raised in different families and the challenges of teasing out effects in twin studies.
15:52: Controversy surrounding the genetic component of IQ, particularly in relation to ethnic differences and media attention.
21:05: Misuse of genetic research to maintain power and wealth, hindering education system in the US.
26:54: Controversy surrounds the measurement of intelligence by IQ tests, with genetic assumptions challenged.
32:45: Challenges in twin studies due to lack of statistical significance in IQ correlations.
37:36: Issues with research publication pressure and ideological bias in psychology and political science.
42:35: Challenges in genetic research methods impacting heritability estimates.
48:00: Genetic influence in psychiatric disorders and intelligence research questioned.
53:06: Challenges in academic research due to biases, silo mentality, and lack of acknowledgment of conflicts of interest.
58:08: Exploring societal influences on mental health research and the limitations of focusing solely on biological factors.
1:03:31: Challenges with twin studies and their implications on genetic influences.
----
My ebooks: https://jenhowk.gumroad.com
Join my membership community (courses, group coaching, 1:1 connections and messaging, and more): https://collective.jenhowk.com