
Contents
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I. Descartes and the Discovery of Transduction I. Descartes and the Discovery of Transduction
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II. How Can Sensation Function without Classification? II. How Can Sensation Function without Classification?
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III. Visual Processing III. Visual Processing
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IV. Feature Maps and Feature Integration IV. Feature Maps and Feature Integration
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V. Classification and Realism V. Classification and Realism
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2 Sensory Classification: The View from Psychology
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Published:February 2005
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Abstract
Descartes realized that the retinal image would have to be transformed into Amovements of the brain@ and then into ideas before it could become material for sensory or mental operations; he discovered what today is called Atransduction@. The current neurocomputational paradigm goes further: it sees sensory systems as processing transduced signals in the search for the occurrence of specific events or conditions and discarding all information irrelevant to these. When a particular feature is detected, the system enters into a characteristic state: for instance, a neuron might fire to signal the detection of a particular feature. A perceiver gains access to this event through a conscious sensation, which is in no way an image or picture. The features that a system detects in this way are often objective characteristics of external things. This opens the door to realism with respect to sensory classification.
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