1st Edition

The Great Psychology Delusion Missteps, Pitfalls and How to Make a More Successful Psychological Science

By Craig Speelman, Marek McGann Copyright 2026
216 Pages 10 B/W Illustrations
by Routledge

216 Pages 10 B/W Illustrations
by Routledge

216 Pages 10 B/W Illustrations
by Routledge

The Great Psychology Delusion takes an unflinching look at some of the foundational assumptions of psychological science. Exploring long-standing unanswered critiques of psychological research in a way that is detailed but accessible, the book brings together a wealth of material that challenges our understanding of what the science of psychology really is, and how the subject matter of that... Read more

Preface

Acknowledgements


Part I: Missteps and Pitfalls

Chapter 1: The Great Delusion

Chapter 2: The Aggregation Delusion: A Science of People, or Persons?

Chapter 3: The Delusions of Experimental Control, Group Comparison and Correlation

Chapter 4: The Delusions of Pervasiveness, Generalisation and Specificity

Chapter 5: The Simplicity Delusion: Theorising in Psychology is Hard

Chapter 6: The Scientist-Practitioner Delusion


Part II: Towards a More Successful Psychological Science

Chapter 7: A Pluralistic Psychological Science

Chapter 8: Taking Stock of the Research Toolbox

Chapter 9: Building the Case for a More Valid Science

Chapter 10: Learning from a Mixed History

Chapter 11: From Delusion to Dream


References

Index

 

Biography

Craig P. Speelman is Professor of Cognitive Psychology in the School of Arts and Humanities of Edith Cowan University, Australia.

Marek McGann is Lecturer in the Department of Psychology of Mary Immaculate College, Ireland.

'Speelman and McGann’s critique of the assumptions that underlie much contemporary research in psychology reveals the flaws that have impeded its development as a science. This book is a major work that should reform research practice in the field.'

Geoff Hammond, Emeritus Professor, University of Western Australia

'The book by Speelman and McGann has many nuggets of wisdom of which my favorite is their aggregation delusion, and additional delusions follow. I recommend the book for those who wish to become better researchers or better research consumers.'

David Trafimow, Professor, New Mexico State University

'Given its subject matter, I wasn’t expecting to feel so invigorated, inspired, and hopeful about psychology once I’d finished reading. Speelman and McGann offer an incisive dissection of psychology’s current ills, and a thoughtful discussion, with workable solutions, for how we can remedy them. I cannot recommend this book highly enough — everyone even remotely interested in psychology should read it.'

Louise Barrett,
FRSC, Professor, University of Lethbridge, Canada