The Claustrum

1st Edition

Structural, Functional, and Clinical Neuroscience

Editors: John R. Smythies Lawrence Edelstein Vilayanur Ramachandran
Hardcover ISBN: 9780124045668
eBook ISBN: 9780124047228
Imprint: Academic Press
Published Date: 3rd January 2014
Page Count: 408
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The present day is witnessing an explosion of our understanding of how the brain works at all levels, in which complexity is piled on complexity, and mechanisms of astonishing elegance are being continually discovered. This process is most developed in the major areas of the brain, such as the cortex, thalamus, and striatum. The Claustrum instead focuses on a small, remote, and, until recently, relatively unknown area of the brain. In recent years, researchers have come to believe that the claustrum is concerned with consciousness, a bold hypothesis supported by the claustrum’s two-way connections with nearly every other region of the brain and its seeming involvement with multisensory integrations—the hallmark of consciousness. The claustrum, previously in a humble position at the back of the stage, might in fact be the conductor of the brain’s orchestra.

The Claustrum brings together leading experts on the claustrum from the varied disciplines of neuroscience, providing a state-of-the-art presentation of what is currently known about the claustrum, promising lines of current research (including epigenetics), and projections of new lines of investigation on the horizon.

Key Features

  • Develops a unifying hypothesis about the claustrum’s role in consciousness, as well as the integration of sensory information and other higher brain functions. 
  • Discusses the involvement of the claustrum with autism, schizophrenia, epilepsy, Alzheimer’s disease, and Parkinson’s disease
  • Coverage of all aspects of the claustrum, from its evolution and development to promising new lines of research, including epigenetics, provides a platform and point of reference for future investigative efforts


Researchers and advanced students in neuroscience, neurology, neuropsychiatry, and neuropsychology

Table of Contents

List of Contributors



Lawrence (‘Larry’) Edelstein

Vilayanur (‘Rama’) Ramachandran

John Smythies

Chapter 1. History of the Study and Nomenclature of the Claustrum

The First Era: 1780–1820

The Second Era: 1820–1870

The Third Era: 1870–1950

The Fourth Era: 1950–2000

The Fifth Era: 2000–INTO the Future



Chapter 2. The Structure and Connections of the Claustrum


Structure of the Claustrum

Distribution of Neurochemicals

Afferent Connections of the Claustrum

Efferent Connections of the Claustrum

Projections of the Ventral Claustrum (Endopiriform Nucleus)

Discussion and Conclusions


Chapter 3. The Neurochemical Organization of the Claustrum


The Claustrum: Basic Organization

Multiple Cortical Maps and the Organization of the Claustrum

What Does the Claustrum Contribute to Information Processing in the Cerebral Cortex? Studies of the Visual Claustrum

Neurochemistry of the Claustrum

Implications of Multiple Neurochemically Defined Cell Types for Intraclaustral Processing


Summary: Neurochemistry and the Functions of the Claustrum


Chapter 4. Development and Evolution of the Claustrum


Research Antecedents

The Apparent Lack of a Claustrum in Monotremes

The Advent of Molecular Markers

Recent Genoarchitectonic Analysis of Claustrum Development and its Radial Topology Supports a Relationship with the Insula

Discussion of these Results

A Glance at the Emerging Evolutionary Scenario


Chapter 5. Physiology of the Claustrum





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About the Editor

John R. Smythies

John Smythies is a neuropsychiatrist and neuroscientist and has made significant contributions to both these disciplines. Together with Humphrey Osmond he developed the first biochemical theory of schizophrenia—the transmethylation hypothesis. This has recently come back into focus following the finding that DNA methylation is abnormal in schizophrenia. He has made extensive contributions to knowledge in a number of fields including the neuropharmacology of psychedelic drugs; the functional neuroanatomy of synapses with particular regard to the role of synaptic plasticity, endocytosis and redox factors ; the role in the brain of orthoquinone metabolites of catecholamines; and, in particular, theories of brain-consciousness relations. More recently he has worked on epigenetic processes in information processing in the brain, and the functional neuroanatomy of the claustrum. Smythies has served as President of the International Society of Psychoneuroendocrinology from 1970-1974, Consultant to the World Health Organization from 1963-1968, and Editor of the International Review of Neurobiology from 1958-1991. He was elected a member of the Athenaeum in 1968. He has published over 240 scientific papers and sixteen books. Smythies has held positions as the Charles Byron Ireland Professor of Psychiatric Research at the University of Alabama Medical Center at Birmingham, Visiting Scholar at the Center for Brain and Cognition, University of California San Diego, and Senior Research Fellow at the Institute of Neurology, University College London.

Affiliations and Expertise

Center for Brain and Cognition, University of California, San Diego, USA

Lawrence Edelstein

Spring semester 1974, State University of New York at Stony Brook, “Introduction to Physiological Psychology,” Professor John Stamm (mentor and frontal lobe physiologist par excellence). “Essentials of Physiological Psychology,” by Sebastian P. Grossman. As a significant percentage of our final grade, we were tasked with submitting a term paper on the brain structure of our choosing, to be selected from those mentioned in our textbook. Owing to an already burdensome semester with numerous finals in the air, I immediately went to work looking for that part of the brain to which was paid the least attention, in essence, the Rodney Dangerfield of the CNS. Hippocampus? Fuhgeddaboudit. Amygdala? Fight or flight; I chose the latter. Claustrum – function unknown; barely made the index. Clearly, it got no respect. The seed was planted, eventually sprouting into a doctoral thesis: “The anatomy of the claustrum: A light and electron-microscopic analysis in rat and monkey incorporating the technique of HRP cytochemistry.” I moved to San Diego in late 2001, the claustrum something I once dabbled with in the distant past. Cut to September 27, 2004 and the live-streamed public memorial held at The Salk Institute for Francis Crick. Although I was long into a new career and deskbound at the time, I felt the need to somehow be a part of this event, if only as a virtual observer. Thick with notables, Nobelists (and those to be) and molecular biology, I watched and listened with rapt attention as V.S. Ramachandran took the podium and proceeded to eloquently honor a close friend and esteemed colleague. Somewhere in the middle of his tribute I learned of Francis’ interest in the claustrum, at which point my jaw dropped rather precipitously, and a few choice unmentionables were uttered upon return to its normal position. A comprehensive review paper followed shortly thereafter, co-authored with my long-time friend and fellow claustrophile, Professor Frank Denaro. For some time prior t

Affiliations and Expertise

Medimark Corporation, Del Mar, CA

Vilayanur Ramachandran

V. S. Ramachandran is Director of the Center for Brain and Cognition and Distinguished Professor with the Psychology Department and Neurosciences Program at the University of California, San Diego, and Adjunct Professor of Biology at the Salk Institute. Ramachandran initially trained as a doctor and subsequently obtained a Ph.D. from Trinity College at the University of Cambridge. Ramachandran's early work was on visual perception but he is best known for his experiments in behavioral neurology which, despite their apparent simplicity, have had a profound impact on the way we think about the brain. He has been called "The Marco Polo of neuroscience" by Richard Dawkins and "The modern Paul Broca" by Eric Kandel. In 2005 he was awarded the Henry Dale Medal and elected to an honorary life membership by the Royal Institution of Great Britain, where he also gave a Friday evening discourse (joining the ranks of Michael Faraday, Thomas Huxley, Humphry Davy, and dozens of Nobel Laureates). His other honors and awards include fellowships from All Souls College, Oxford, and from Stanford University (Hilgard Visiting Professor); the Presidential Lecture Award from the American Academy of Neurology, two honorary doctorates, the annual Ramon Y Cajal award from the International Neuropsychiatry Society, and the Ariens-Kappers medal from the Royal Netherlands Academy of Sciences. In 2003 he gave the annual BBC Reith lectures and was the first physician/psychologist to give the lectures since they were begun by Bertrand Russel in 1949. In 1995 he gave the Decade of the Brain lecture at the 25th annual (Silver Jubilee) meeting of the Society for Neuroscience. In 2010 he delivered the annual Jawaharlal Nehru memorial lecture in New Delhi, India. Most recently the President of India conferred on him the second highest civilian award and honorific title in India, the Padma Bhushan. And TIME magazine named him on their list of the 100 most influential people in the world in 2011.

Affiliations and Expertise

Director, Center for Brain and Cognition, and Professor, Psychology Department and Neurosciences Program, University of California, San Diego; Adjunct Professor of Biology, Salk Institute for Biological Studies, CA, USA


"Researchers…share their results regarding a part of the brain that received little attention until recently but is now thought to be connected to consciousness. Among the topics are: the history of the study and nomenclature of the claustrum; neurocomputation and coding in the claustrum in comparison with the pulvinar…", April 2014