Send a love message

The Great Psychology Delusion: Why the Mean Misleads and Pluralism Matters

Read the book here.

This is an academic psychology-focused episode with lecturer Marek McGahn, whose work spans enactive cognitive science, embodiment, politics, feminist philosophy, and STS. Andrea and Marek discuss his co-authored book The Great Psychology Delusion with Craig Speelman. McGahn explains why “delusion” fits psychology’s persistence in treating long-critiqued assumptions as valid, especially the aggregation delusion: averaging group data and applying it to individuals despite human non-interchangeability and change over time, linked to the ergodic assumption and ergodic theorem conditions rarely met in human behavior. They discuss how averaging can create misleading “laws” (e.g., power law of learning), the research–practice gap in clinical work, psychology’s history and method-driven identity, and the need for disciplined, pluralistic, scale-aware science that better integrates perspectives and practitioner expertise.

00:00 Show Intro And Guest
01:23 Book Thesis And Stakes
02:24 Aggregation Delusion Explained
03:54 Research Practice Gap
04:49 More Detailed Book Summary
07:47 Averaging Artifacts And Ergodicity
09:29 Careful Critique Not Anti Psychology
11:06 Warm Reorientation Sendoff
11:51 Conversation Begins
15:17 Why Call It Delusion
20:11 How Psychology Became Method Led
31:08 Aggregation Delusion Deep Dive
33:35 Ergodic Fallacy in Humans
35:21 Scale Slippage and Delusion
37:59 Research Practice Gap Explained
41:01 Clinician Code Switching
42:46 Many Scales of Mind
43:57 MRI Averaging Pitfalls
48:32 Method Silos and Identities
52:43 Care, Careers, and Canalization
55:27 GPS Model for Pluralism
01:00:33 Pluralism Not Relativism
01:02:58 Why Marek Cares
01:06:06 Psychology’s Moment of Change
01:06:56 Closing Thanks and Wrap

Marek McGann has been a lecturer in the Department of Psychology since 2005. His principal research is theoretical work on the enactive approach to cognitive science, which examines the mind more as something we do rather than something we have. This is also related to ecological approaches to psychology, which explore how behaviour and mental life can be examined by looking at what your head is in, rather than what is in your head. He also has a related interest in critical considerations of theory and scientific practice in psychology more broadly.

Marek co-convenes the ENSO Seminars, a series of online seminars with researchers from enactive and ecological cognitive science.

Support the show

Please rate and review with love.
YouTube, Facebook, Instagram, Substack.

The Great Psychology Delusion: There is No Mean with Marek McGann

Love & Philosophy

The Great Psychology Delusion: There is No Mean with Marek McGann