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The I Index

Brandy Schillace,
The Wall Street Journal
... at once poignant, surprising and sometimes horrifying.
James McConnachie,
The Sunday Times (UK)
... extraordinary.
Emily Eakin,
The New York Times Book Review
... fascinating and provocative.
Alice Robb,
The New Statesman (UK)
O’Sullivan travels the world collecting fascinating stories of culture-bound syndromes, which she relays with nuance and sensitivity.
Katy Guest,
The Guardian (UK)
In this illuminating and often challenging book, [O'Sullivan] travels the world, bringing her expertise and curiosity to some astonishing cases of MPIs.
Carol Tavris,
The Times Literary Supplement (UK)
O’Sullivan’s fair and detailed analysis of Havana Syndrome is itself worth the price of this book.
Penelope Cottier,
The Canberra Times (AUS)
...gripping, sometimes even disturbing, and will stay with the reader for a long time.
Tony Miksanek,
Booklist
[O'Sullivan] convincingly explains how psychological, cultural, and social factors give rise to symptoms and can produce disability. She provides a powerful perspective of functional neurological disorders.

Kirkus
O’Sullivan, a London-based Irish neurologist, marches straight into this deep, strange pocket of experience. A pleasing storyteller, she puts to good use her neurological background while melding it with a closely observed appreciation of environmental, social, and cultural elements in the dissociative process.

Publishers Weekly
Drawing on fascinating case studies, neurologist O’Sullivan delivers a razor-sharp study of illnesses that often cannot be explained in traditional medical terms.