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Beskrivelse
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 onthe oncoming car being detected at unconscious levels in the visual system. So how, and at what level in the visual system is a stimulus processed unconsciously?This book explores unconscious and conscious vision, investigated using psychophysical and brain-recording methods. These methods allow microtemporal analyses of visual processing during the interval, ranging from a few 10s to a few 100s of milliseconds, between a stimulus's impinging on the retinae and its eliciting a behavioral response or a conscious percept. By tying these findings to well-known neuroanatomical and physiological substrates of vision, the book presents and discussestheoretical and empirical approaches to, and findings on, conscious and unconscious vision.In addition to presenting an in-depth, integrative review of recent and ongoing scientific and scholarly research, the book proposes several avenues for directing future research in these areas. It also provides a well articulated theoretical and a detailed empirical base that points to the special importance of the processing of surface properties of visual objects to their conscious vision. Aimed at scientists and scholars in visual cognition, visual neuroscience and, more broadly, cognitive science - including that part of the philosophical community that is currently occupied with the mind-brain problem, the book sheds new light on and advances experimental, philosophical, and scholarly research on visual consciousness.The waning of the Cold War means that major political powers no longer feel compelled to support African authoritarianism. Revised official consensus holds that, in Africa as elsewhere, political reform must accompany economic adjustment. According to this view, African recovery requires a reduction in the size and economic role of monopolistic and inefficient states, and their transformation into accountable liberal democracies. Is this a desirable and practicable political programme? Certainly, all over Africa the number of liberal democracies is growing. But can they survive and are they compatible with renewed economic growth? Richard Sandbrook answers these questions, and assesses the feasibility of the new political programme in reinforcing Africa's economic recovery. He argues that the programme has merit in the short term, but, in the longer term, a more self-reliant, state-directed approach should be adopted to ensure prosperity and durable democracy in the region.
