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Our visual system can process information at both conscious and unconscious levels. Understanding the factors that control whether a stimulus reaches our awareness, and the fate of those stimuli that remain at an unconscious level, are the major challenges of brain science in the new millennium. The substantially revised new edition of this classic text explores temporal aspects of both conscious and unconscious processes.

Sight can be so effortless, so useful, and so entertaining--the average human can distinguish several million colors; a falcon can see a fencepost from three thousand yards--that we never stop to think about how complex a process it is and how easily it can fail us. We never have as clear and complete a picture of the world around us as we think we do. The gaps between what our eyes take in and what is in our mind's eye provide the unifying theme in Bruno Breitmeyer's wide-ranging volume. In his fascinating account of the many ways that our eyes, and minds, both see and fail to see,...

Visual control of our actions can be unconscious as well as conscious. For example, when a pedestrian steps onto a street and then suddenly steps back, to avoid being hit by an oncoming car, the pedestrian's visual system has been able to detect the car very rapidly. Since the registration of the approaching car in conscious vision could take a few hundreds of milliseconds - possibly too long to avoid being struck by it, the rapid injury-avoiding action has relied on the oncoming car being detected at unconscious levels in the visual system. So how, and at what level in the visual system is a...