Schneider A M, Tyler J, Jinich D
Science. 1974 Apr 5;184(4132):87-8. doi: 10.1126/science.184.4132.87.
Retrograde amnesia was produced in rats by electroconvulsive shock. Memory recovered if the animals were given repeated test trials. Memory did not recover if steps were taken to reduce the conditioning properties of the test trials; the manipulations included eliminating the response, altering the apparatus cues, or extinguishing conditioned "fear" by confining animals to the apparatus during the first test trial.
