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Symptoms include pain or the development of neural deficits such as weakness , numbness , and tingling . Abstract : Self-organizing maps ( SOM ) are unsupervised , competitive neural networks used to project high-dimensional data onto a low-dimensional space . " One of Bharucha 's interests is using computational neural net models of learning combined with functional MRI to try to show retrospectively that there might have been plasticity . These findings demonstrate that neural activity in dopamine-rich regions of the brain can be activated by a variety of stimuli , including those not specifically associated with reward .