Create a 4 pages paper that discusses learning & physiological psychology. For the rats a daily retrieval from drug related memories at 10 minutes to an hour though not 6 hours earlier that the extinction session, attenuating drug originating reinstatements, spontaneous recoveries and further conditioned drugs effects renewal and drugs seeking. For the heroin addicts, the retrieval on the drug-related memories at 10 minutes prior to the extinction period attenuated cue triggered heroin craves 1, 30 to 180 days after. A memory retrieval extinction process served to replicate the study to humans in lowering cravings and abstinences relapses (Ecker, 2012).The studys aim was to recover heroin in-patient addicts. On the first day, it consisted of actual measuring of heroin craving using visual analogue scales where participants had to rate their cravings scaling from 1 to 10. The second day saw the addicts were devolved into three sets. The first group consisted of non memory retrieval-extinction subjects, the second, was formed from memory retrievals under 10 minute duration delays and extinction while the third and last group consisted of memory retrievals under 6 hours delays and extinction. Measurements on blood pressure and heart rates were also recorded for all the participants. So as to avail more evaluation on reactions to cues the measurements were taken before and after cue induction (Ecker, 2012). A 5 minute long, heroin related, video was also viewed by the participants during memory retrieval. While under the extinction process, they were further exposed to 3 cues that were correlated to heroin, drug paraphernalia, for 4 sessions. Both stages took place over a 2 consecutive days period.Following the extinction, the participants were requested to rate how they craved for heroin at that moment while measurements on blood pressures and heart rates were taken. Using visual analogue scales the crave levels were retaken in the 4th, 34th and 184th days.