Callosal Agenesis

1. Front Matter

   Pages i-ix

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2. Neuroclinical Findings

   1. Clinical Description and Related Disorders

      1. Callosal Agenesis: Review of Clinical, Pathological, and Cytogenetic Features

         • Krystyna E. Wisniewski, Joseph S. Jeret

         Pages 1-6

      2. The Aicardi Syndrome

         • Jean Aicardi, Jean-Jacques Chevrie

         Pages 7-17

      3. The Andermann Syndrome: Agenesis of the Corpus Callosum and Sensorimotor Neuropathy

         • Frederick Andermann, Eva Andermann

         Pages 19-26

      4. The Pathology of the Andermann Syndrome

         • Stirling Carpenter

         Pages 27-30

      5. Genetic Studies of the Andermann Syndrome

         • Eva Andermann, Frederick Andermann, Richard Nagy, Denis Bergeron, Jean Mathieu, Pierre Langevin

         Pages 31-38

      6. A New Syndrome: Familial Fronto-Nasal Dermoid Cysts with Agenesis of the Corpus Callosum

         • Ivan Jacobson, Malcolm A. Jeeves

         Pages 39-53

      7. Other Syndromes Frequently Associated with Callosal Agenesis

         • Guy Geoffroy

         Pages 55-62

   2. Neurorndiological Characteristics

      1. Antenatal Sonographic Findings of Agenesis of Corpus Callosum

         • Patrizia Vergani, Nicola Strobelt

         Pages 63-67

      2. Callosal Agenesis: Postnatal Sonographic Findings

         • Giovanni Cioni, Laura Bartalena, Enrico Biagioni, Antonio Boldrini

         Pages 69-76

      3. CT Findings in Callosal Agenesis

         • Denis Melanson, Armando Salazar, Raquel del Carpio-O’Donovan

         Pages 77-82

      4. Magnetic Resonance Imaging of Corpus Callosum Dysgenesis

         • Ronald A. Rauch, J. Randy Jinkins

         Pages 83-95

   3. Neurorndiological Characteristics

      1. Coherence Patterns of Infant Sleep EEG in Absence of the Corpus Callosum

         • Jan B. M. Kuks, Johan E. Vos

         Pages 97-108

      2. Sleep, Dreaming and EEG Coherence Patterns in Agenesis of the Corpus Callosum: Comparisons with Callosotomy Patients

         • Tore A. Nielsen, Jacques Montplaisir, Roger Marcotte, Maryse Lassonde

         Pages 109-117

3. Animal Models

   1. Aspects of Dendritic Maturation of Callosally Projecting Neurons

      • Giorgio M. Innocenti

      Pages 119-123

   2. Defects of the Fetal Forebrain in Acallosal Mice

      • Douglas Wahlsten, Hiroki S. Ozaki

      Pages 125-133

   3. Pattern of Interhemispheric Connections in Mice with Congenital Deficiencies of the Corpus Callosum

      • Jaime Olavarria, Marcos M. Serra-Oller, Kathleen T. Yee, Richard C. Van Sluyters

      Pages 135-146

   4. Three Different Animal Models of Early Callosal Defects: Morphological and Behavioral Studies

      • Sergio L. Schmidt

      Pages 147-154

4. Neuropsychological Description

   1. Sensory and Sensorimotor Functions

      1. Midline Sensory Integration in Callosal Agenesis

         • Franco Lepore, Maryse Lassonde, Pierre Poirier, Alessandra Schiavetto, Nathalie Veillette

         Pages 155-169

      2. Visual Integration in Callosal Agenesis

         • A. David Milner

         Pages 171-183

This book is devoted to the description of agenesis of the corpus callosum, a congenital malformation of midline structures in the brain that may be regarded as a natural model of the "split-brain. " First reported by Rei! in 1812, this anomaly has since been described by several investigators. Interest in this malformation was revived in the 1970s by studies of interhemispheric transfer in Bogen and Vogel's commissurotomized patients and the subsequent findings by Sperry that acallosal patients were devoid of the typical disconnection deficits found in patients with surgical transection of the corpus callosum. Since this seminal work, the bulk of neuropsychological research on callosal agenesis has focused on the particulars of interhemispheric transfer and integration. An ever-growing literature has emerged on the subject, attempting to specify the extent and limits of neural plasticity in a nervous system that has evolved in the absence of the most important interhemispheric pathway. Whilst callosal agenesis proves to be an excellent model of cerebral plasticity, it has to be pointed out that this anomaly is often associated with other malformations and neurological diseases that may result in different degrees of mental retardation or other cognitive and sensorimotor deficits. In this context, neurological research on callosal agenesis has concentrated on the description of various syndromes associated with this pathology as well as on the attempt to specify its neurobehavioral manifestations.

• Nervous System
• Syndrom
• brain
• electroencephalography (EEG)
• forebrain
• syndromes

• Université de Montréal, Montréal, Canada

  Maryse Lassonde

• University of St. Andrews, St. Andrews, Scotland, UK

  Malcolm A. Jeeves

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