Neuroscientist Don Pfaff defines a drive as a neural state that energizes and directs behavior to acquire a particular biological need to survive or reproduce.39 We have lots of drives. They lie along a continuum. Some, like thirst and the need for warmth, cannot be extinguished until satisfied. The sex drive, hunger, and the maternal instinct, on the other hand, can often be redirected, even quelled with time and effort. I think the experience of falling in love lies somewhere along this continuum.
