The nervous system is unique with a complex set of interacting functional modalities such as those underlying the processing of sensory information, motor control, learning and memory, attention and emotion. These functions emerge from a complex and highly organized substrate with unique adaptive capabilities. In this sense it is different from other biological and physical systems. Levels of organization appear at many spatial and temporal scales, from molecules to circuits and systems and from microseconds to years. This makes the goals of neuroscience unique and so challenging.
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