The First Half Second

The Microgenesis and Temporal Dynamics of Unconscious and Conscious Visual Processes
Overview

Recent advances in the study of visual cognition and consciousness have dealt primarily with steady-state properties of visual processing, with little attention to its dynamic aspects. The First Half Second brings together for the first time the latest research on the dynamics of conscious and unconscious processing of visual information, examining the time-course of visual processes from the moment a stimulus is presented until it registers in a behavioral response or in consciousness a few hundred milliseconds later. The contributors analyze this "first half second" of visual processing—known as its microgenesis—from a variety of perspectives, including neuroscience, neuropsychology, psychophysics, psychology, and neural network modeling.

The book first treats conceptual, methodological, and historical issues and provides an integrated review of findings from recent studies on the neural underpinnings of consciousness. The book then turns to neurophysiological correlates of dynamic processing in vision, highlighting the temporal dimension of functional distinctions; visual masking and what it can tell us about the operation of both normal and abnormal brains; the dynamics of attentional mechanisms from electrophysiological, behavioral, and modeling perspectives; and temporal characteristics of object and feature perception. Finally, drawing on the foundations laid in earlier chapters, the book elaborates further on the dynamic relation of conscious and unconscious processes in vision. The First Half Second fills the need for an interdisciplinary dialogue on the study of the dynamic aspects of visual processing and, with its rich empirical and theoretical findings, charts promising directions for future research.

Table of Contents

  1. Preface
  2. Acknowledgements
  3. 1. Introduction
  4. CONCEPTUAL ISSUES IN STUDYING CONSCIOUS AND UNCONSCIOUS VISUAL PROCESSES
  5. 2. Microgenesis of Perception: Conceptual, Psychophysical, and Neurobiological Aspects

    Talis Bachmann

  6. 3. Neural Correlates and Levels of Conscious and Unconscious Vision

    Bruno G. Breitmeyer and Petra Stoerig

  7. NEUROPHYSIOLOGICAL CORRELATES OF DYNAMIC PROCESSING IN VISION
  8. 4. Grasping the Past and Present: When Does Visuomotor Priming Occur?

    Melvyn A. Goodale, Jonathan S. Cant, and Grzegorz Krliczak

  9. 5. The Cortical Processing Dynamics of Edge Detection and Scene Segmentation

    H. Steven Scholte, Jacob Jolij, and Victor A. F. Lamme

  10. 6. Consciousness Absent and Present: A Neurophysiological Exploration of Masking

    Edmund T. Rolls

  11. VISUAL MASKING AND THE DYNAMICS OF VISION
  12. 7. Computational Models of Visual Masking

    Gregory Francis and Yang Seok Cho

  13. 8. A Reentrant View of Visual Masking, Object Substitution, and Response Priming

    James T. Enns, Alejandro Lleras, and Vince Di Lollo

  14. 9. Dynamics of Perceptual Epochs Probed by Dissociation Phenomena in Masking

    Haluk gmen, Bruno G. Breitmeyer, and Harold E. Bedell

  15. 10. Backward Masking in Schizophrenia: Neuropsychological, Electrophysiological, and Functional Neuroimaging Findings

    Jonathan K. Wynn and Michael F. Green

  16. TEMPORAL ASPECTS OF ATTENTION
  17. 11. The Operation of Attention—Millisecond by Millisecond—Over the First Half Second

    Steven J. Luck

  18. 12. Competition for Attention in Space and Time: The First 200 ms

    Mary C. Potter

  19. 13. Effects of Masked Stimuli on Attention and Response Tendencies as Revealed by Event-Related EEG Potentials: Possible Application to Understanding Neglect

    Rolf Verleger and Piotr Jaskowski

  20. TEMPORAL CHARACTERISTICS OF FEATURE AND OBJECT PERCEPTION
  21. 14. Perceptual Consequences of Timing Differences Within Parallel Feature-Processing Systems in Human Vision

    Harold E. Bedell, Saumil S. Patel, Susana T. L. Chung, and Haluk gmen

  22. 15. The Relationship of Visual Masking and Basic Object Recognition in Healthy Observers and Patients with Schizophrenia

    Michael H. Herzog

  23. 16. Neural Mechanisms Underlying Temporal Aspects of Conscious Visual Perception

    Wei Ji Ma, Fred Hamker, and Christof Koch

  24. THE DYNAMIC RELATION OF UNCONSCIOUS AND CONSCIOUS PROCESSES IN VISION
  25. 17. Response Priming With and Without Awareness

    Jens Schwarzbach and Dirk Vorberg

  26. 18. Visual Masking Reveals Differences Between the Nonconscious and Conscious Processing of Form and Surface Attributes

    Bruno G. Breitmeyer and Haluk gmen

  27. 19. The Cognitive Neuroscience of Unconscious and Conscious Vision

    Tony Ro

  28. Epilogue
  29. Glossary
  30. References
  31. Contributors
  32. Index