Biologically Primary vs. Secondary Learning With David Geary

In this episode of The Thought Stretchers Podcast, host Drew Perkins revisits David Geary, a leading expert in cognitive development and evolutionary psychology, six years after their first conversation. Geary, a curator's distinguished professor at the University of Missouri, reflects on his foundational theory of biologically primary and secondary learning, which distinguishes between innate, evolutionarily developed cognitive systems (like language and face recognition) and culturally constructed academic skills (like reading, writing, and algebra) that require formal instruction. Drawing on recent brain imaging research, Geary highlights the shared role of the cognitive control network in both reading and math, reinforcing the need for structured, explicit teaching in secondary domains. He discusses the long-term consequences of school closures during the pandemic, predicting significant learning loss—especially for disadvantaged students—due to the absence of structured schooling. The conversation also explores the teachability of critical thinking, the heritability of cognitive abilities, and the importance of moving beyond narrow debates about equity versus excellence to focus on raising the overall educational bar for all students. Geary emphasizes that while domain-general problem-solving skills have a genetic component, they can still be nurtured through deliberate instruction and inquiry-based learning, especially when grounded in solid foundational knowledge. Key takeaways include: (1) Biologically primary skills develop naturally with experience but require rich input; secondary skills must be explicitly taught. (2) Cognitive load theory and explicit instruction are essential for building the schema needed for complex learning. (3) Deep understanding is best assessed through multi-modal expression (verbal, visual, gestural), not just rote recall. (4) Inquiry and discovery have value, especially when guided and integrated with knowledge-building, particularly in early education. (5) Gender differences in cognitive strengths (e.g., girls in language, boys in visual-spatial math) inform instructional differentiation but should not limit expectations. (6) Educational policy should aim to raise the mean performance across all students rather than obsess over reducing variation. (7) Meaning-making and conceptual understanding are best revealed through dialogue and cross-modal expression. (8) The goal of education should be functional literacy and numeracy for all, preparing individuals to thrive in modern society.