Abstract

in's face (A) is seen through small apertures (B), its meaning as a face is greatly degraded. ears sequentially. To process a pattern of sounds as a whole, it must be "recoded". Such a recoding, or processing stage, is often called a working memory, which stores short-termmemory traces. To identify familiar events, the brain compares short-term traces with stored categories. These categories are accessed using long-term-memory traces, which represent previous experiences that have been acquired through learning. Somehow, we can rapidly learn new facts--placing them in long-term memory--without being forced just as rapidly to forget others. How does brain processing keep old memories stable and still maintain enough plasticity to learn new things? What I call the stabilityplasticity dilemma must be solved by every brain system that attempts to learn about the flood of external signals. I shall examine several challenging examples of visual and auditory data that suggest how the brain mi

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