Poster D74, Monday, March 26, 8:00-10:00 am, Exhibit Hall C
Consolidated-like memories through testing
Jaione Arnaez-Telleria1, Manuel Carreiras1,2,3, Pedro M. Paz-Alonso1; 1BCBL - Basque Center on Cognition, Brain and Language, Donostia-San Sebastián, Spain, 2IKERBASQUE, Basque Foundation for Science, Bilbao, Spain, 3Departmento de Lengua Vasca y Comunicación, UPV/EHU, Bilbao, Spain
Testing during encoding is more beneficial for long-term memory relative to strategies based on repeated-study. This benefit is known as the testing effect (TF). The retention interval (RI) between the encoding and the final test is a critical factor in this effect, showing bigger TFs with RIs longer than 24h. Thus, consolidation processes may be relevant in the TF and, therefore, manipulating sleep periods can give us a better insight on the role of consolidation in this beneficial effect. The present study was aimed at investigating the effects of sleep in episodic memory retrieval for information encoded via repeated retrieval (RR) or repeated study (RS). Eighty young adults encoded 120 Swahili-Spanish word-pairs either under RT or RS conditions. Participants took three cued-recall tests with 12 hours, 24 hours and 7 days RIs. Four groups were created by combining the encoding strategy (RT, RS) and having or not immediate sleep after the initial encoding (Sleep, Wake). Behavioral data revealed a beneficial effect of RR relative to RS in all three RIs, except for the shortest RI: RS-Sleep group performed similar to RR-Sleep. However, this null effect of sleep for the RS-Sleep group vanished in the longer RIs. Neuroimaging data revealed stronger hippocampal engagement for RS-Sleep versus RS-Wake groups during successful memory retrieval in the shortest RI. Interestingly this difference also vanished in the longer RIs. Our results suggest that information studied via RR lead to consolidated-like memories, while memories encoded via RS were more susceptible to benefit from regular consolidation processes.
Topic Area: LONG-TERM MEMORY: Semantic