Wonderfull great site http://www.broadbandinternetuk.org.uk/provigil-expiration.pdf provigil pharmaceutical company  The scientists now believe that a place memory, stored in brain cells of the hippocampus, can "call up" different sets of neurons in the amygdala, invoking either good or bad emotions - and their experiments tweaked that wiring, so that the original memory produced an altered emotional response.