The so-called goodness and badness of sensory stimuli and motor actions needs to be estimated to make decisions effectively. We can imagine that good and bad are two ends of a single continuum, or dimension, of value. This would be analogous to the single dimension of light intensity, which ranges from dark on one end to bright light on the other, with many shades of gray in between. Past models of behavior and learning have been based on a single continuum of value, and ...
via Medindia Health News
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