neural pathways we don’t use die off over time. What makes our brains hold on to these pathways — and create more — is not simply repeating the same things we’ve learned over and over again, but continually taking on difficult problems.
many of the quant-ities related to suffering are based on perceptions and similar uncertain infer-ences. The uncertainty will necessarily increase frustration since it means the predictions of reward often go wrong . More fundamentally, the computed reward loss can be uncertain, even illusory .