In April 1979 a symposium on "Multiple Somatic Sensory Motor, Visual and Auditory Areas and Their Connectivities" was held at the FASEB meeting in Dallas, Texas under the auspices of the Committee on the Nervous System of the American Physiological Society. The papers presented at that symposium are the basis of most of the substantially augmented, updated chapters in the three volumes of Cortical Sensory Organization. Only material in chap­ ter 8 of volume 3 was not presented at that meeting. The aim of the symposium was to review the present status of the field of cortical representation in the somatosensory, visual and auditory systems. Since the early 1940s, the number of recognized cortical areas related to each of these systems has been increasing until at present the number of visually related areas exceeds a dozen. Although the number is less for the somatic and auditory systems, these also are more numerous than they were earlier and are likely to increase still further since we may expect each system to have essentially the same number of areas related to it.

Table of Contents:
1 Multiple Cortical Visual Areas: Visual Field Topography in the Cat.- 1. Introduction.- 2. Techniques.- 3. Visual Field Topography.- 4. Unexpected Findings.- 5. Conclusion.- 6. Summary.- Acknowledgments.- References.- 2 Comparative Studies on The Visual Cortex.- 1. Introduction.- 2. Extension and Retinotopy of the Striate and Extrastriate Visual Areas in the Rat.- 3. Receptive Field Properties of Neurons in the.- Striate Cortex of the Rat.- 4. Striate-Extrastriate Corticocortical Connections.- in the Rat.- 5. Effects of Postnatal Enucleation of the Eye on the Striate-Extrastriate Connections in the Rat.- 6. Studies on the Visual Cortex of Other Rodents.- 7. Thalamic Afferents to Extrastriate Visual Areas in Rodents.- 8. Behavioral Studies on the Extrastriate Cortex of the Rat and Rabbit.- 9. Conclusions from Studies on the Rat.- 10. Cortical Connections from the Striate Cortex in the Rabbit.- 11. Cortical Connections from the Striate Cortex in the Rat.- Acknowledgments.- References.- 3 Multiple Representations of the Visual Field: Corticothalamic and Thalamic Organization in the Cat.- 1. Introduction.- 2. Retinotopic Organization in Lateral Posterior Complex.- 3. Lateral Posterior Complex Organization.- 4. Interconnections of Cortex and Thalamus.- 5. Summary.- Acknowledgments.- References.- 4 Families of Related Cortical Areas in the Extrastriate Visual System: Summary of an Hypothesis.- 1. Multiple Ascending Channels in the Visual System.- 2. Experimental Questions and an Hypothesis about the Thalamocortical Connections.- 3. Identification of Extrageniculate Thalamic Subdivisions by Their Afferent Connections.- 4. Evidence for Systematic Groupings of Thalamic-Extrastriate Connections.- 5. Family Clusters in the Extrastriate Cortex.- Acknowledgments.- References.- 5 Cortical and Subcortical Connections of Visual Cortex in Primates.- 1. Introduction.- 2. The Principal Afferent Pathways to Cortex.- 3. A Brief Outline of the Subdivisions of Visual Cortex in Primates.- 4. Projections of VI.- 5. Projections of VII.- 6. Projections of MT.- 7. Projections of Other Visual Areas in the OwlMonkey.- 8. Corpus Callosum Projections.- 9. Connections of Subdivisions of Visual Cortex with Subcortical Structures.- 10. Reciprocal and Nonreciprocal Connections.- 11. Laminar Patterns of Connections.- 12. Conclusions.- Abbreviations.- References.- 6 Organization of Extrastriate Visual Areas in the Macaque Monkey.- 1. Introduction.- 2. Two-Dimensional Cortical Maps.- 3. Visual Areas of the Occipital Lobe.- 4. Conclusion.- Acknowledgments.- References.- 7 Visual Topography and Function: Cortical Visual Areas in the Owl Monkey.- 1. Topographic Organization.- 2. Functional Correlates.- 3. Homologous Cortical Visual Areas in Other Species.- 4. Significance of Multiple Cortical Areas.- Acknowledgments.- References.- 8 Cortical Visual Areas of the Temporal Lobe: Three Areas in the Macaque.- 1. Introduction.- 2. The Middle Temporal Area (MT).- 3. Inferior Temporal Cortex (IT).- 4. Superior Temporal Polysensory Area (STP).- 5. An Hypothesis: Three Classes of Extrastriate Visual Areas.- Acknowledgments.- References.