CONTENTS 
Part One ¢ Introduction 
I. Introduction and Overview 
Randy O. Frost and Gail Steketee 
2. Hoarding in History 6 
Ered Penzel 
Part Two * Phenomenology, Epidemiology, and Diagnosis 
3. Phenomenology of Hoarding 19 
Gail Steketee and Randy O. Frost 
4. Ownership and Collecting ~~ 33 
Russell Belk 
5. Diagnosis of Hoarding Disorder ~~ 43 
David Mataix-Cols and Lorena Fernindez de la Cruz 
5. Hoarding Behavior in Other Disorders ~~ 59 
Alberto Pertusa and Andres Fonseca 
7. Comorbidity in Hoarding Disorder ~~ 75 
Michael G. Wheaton and Anna Vian Meter 
8. Acquisition of Possessions in Hoarding Disorder 
Randy O. Frost and Astrid Miiller 
9. Information Processing ~~ 100 
Kiara R. Timpano, Ashley M. Smith, Julia C. Yang, and Demet Cek 
{0. Emotional Attachment to Objects in Hoarding: A Critical Review of the 
Evidence 120 
Stephen Kellett and Kathryn Holden 
|1. Animal Hoarding ~~ 139 
Gary J. Patronek and Catherine R. Ayers 
| 2. Severe Domestic Squalor ~~ 147 
Melissa M. Norberg and John Snotwdon 
Part Three © Etiology 
+3. Genetics and Family Models of Hoarding Disorder ~~ 159 
Matthew E. Hirschrritt and Carol A. Mathews 
| 4. The Neurobiology of Hoarding Disorder 177 
Kristin Slyne and David FE Tolin 
15. Hoarding in Animals: The Argument for a Homology 
Stephanie D. Preston 
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