Conditioned reward effect without a conditioned stimulus: Once conditioned, the visual cortex is activated by reward in the absence of the conditioned visual stimulus, this study found (using fMRI scans in rhesus monkeys) (see link below).  And activation is confined to the specific area that processed the CS.  Reward-only trials strengthened the response.  Dopamine is

It must be love…..

http://www.bbc.co.uk/programmes/b01g4df7 A programme about love (“whatever that is”, as a famous royal once said!), it includes some good neurobiology on dopamine and attraction/obsession, from biological anthropologist Helen Fisher.