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We study the deviations from perfect memory in negative temperature cyclespin glass experiments. It is known that the a.c. susceptibility after thetemperature is raised back to its initial value is superimposed to thereference isothermal curve for large enough temperature jumps DT (perfectmemory). For smaller DT, the deviation from this perfect memory has a strikingnon monotonous behavior: the memory anomaly is negative for small DT's, becomespositive for intermediate DT's, before vanishing for still larger DT's. We showthat this interesting behavior can be reproduced by simple Random Energy trapmodels. We discuss an alternative interpretation in terms of droplets andtemperature chaos.Comment: 12 pages, 12 figures, 2 tables, the tables are modified, the text is  slightly change

Deviations from perfect memory in spin glass temperature cycling experiments