also https://en.wikipedia.org/wiki/Brain_stimulation_reward#Intracranial_self-stimulation_(ICSS)_procedures https://en.wikipedia.org/wiki/Brain_stimulation_rewa

also https://en.wikipedia.org/wiki/Brain_stimulation_reward#Intracranial_self-stimulation_(ICSS)_procedures https://en.wikipedia.org/wiki/Brain_stimulation_reward#Intra... (I'd thought wikimedia used to have a wireheaded rat?)