Can we understand the reasons why people believe 'irrational' things? Lisa Bortolotti's new book makes a helpful contribution to this task ... her book consists of carefully considered distinctions and definitions which enable us to focus on the issues more clearly.

Process North

Why Delusions Matter is an incredible contribution to the philosophy of delusions by the foremost scholar in the field. Bortolotti stresses the continuity of beliefs in clinical and non-clinical contexts, and how we and society should seek to understand the meaning behind delusions and to open up a space of meaning when beliefs are shared.

Matthew Broome, Director of the Institute for Mental Health and Chair in Psychiatry and Youth Mental Health, University of Birmingham, UK

Lisa Bortolotti's masterful book, Why Delusions Matter, not only provides a concise, current synthesis of the vast philosophical literature on delusions, but also sets out a compelling argument for her signature view that delusions can be purposeful, not pathological.

Justin Garson, Professor of Philosophy, Hunter College and The Graduate Center, USA