RT Journal Article
T1 Where to place the rewards? Exploration bias in mice influences performance in the classic hole-board spatial memory test
A1 Sampedro-Piquero, Patricia
A1 Mañas-Padilla, María del Carmen
A1 Ávila-Gámiz, Fabiola
A1 Gil Rodríguez, Sara
A1 Santín-Núñez, Luis Javier
A1 Castilla-Ortega, María Estela
K1 Memoria
K1 Ratones de laboratorio
AB The classic hole-board paradigm (a square arena with 16 holes arranged equidistantly in a 4x4 pattern) assesses both exploration and spatial memory in rodents. For spatial memory training, food rewards are hidden in a fixed set of holes. The animal must not visit (i.e. nose-poke) the holes that are never baited (reference memory; RM) nor re-visit a baited hole within a session (working memory; WM). However, previous exploratory bias may affect performance during reward searching. During habituation sessions with either all holes rewarded or all holes empty, mice intrinsically preferred poking peripheral holes (especially those located in the maze’s corners) over centre holes. During spatial memory training, mice progressively shifted their hole pokes and staying time to the central area that contained hidden rewards, while mice exposed to the empty apparatus still preferred the periphery. A group of pseudotrained mice, for whom rewards were located randomly throughout the maze, also increased their central preference. Furthermore, reward location influenced memory measures. Most repeated pokes (WM-errors) were scored in the locations that were most intrinsically appealing to mice (i.e. the corner and wall baited holes), supporting a strong influence of previous exploratory bias. Regarding RM, finding rewards located in the centre holes, which were initially less preferred, entailed more difficulty and required more trials to learn. This outcome was confirmed by a second experiment that varied the pattern of rewarded holes, as well as the starting positions. Therefore, reward location is a relevant aspect to consider when designing a hole-board memory task.
PB Springer
YR 2019
FD 2019
LK https://hdl.handle.net/10630/23842
UL https://hdl.handle.net/10630/23842
LA eng
NO Sampedro-Piquero P, Mañas-Padilla MC, Ávila-Gámiz F, Gil-Rodríguez S, Santín LJ, Castilla-Ortega E. Where to place the rewards? Exploration bias in mice influences performance in the classic hole-board spatial memory test. Anim Cogn. 2019 May;22(3):433-443. doi: 10.1007/s10071-019-01256-3. Epub 2019 Mar 9. PMID: 30852738.
NO Author manuscript
NO This study was funded by grants from the Spanish Ministry of Economy andCompetitiveness (MINECO, Agencia Estatal de Investigación) cofounded by theEuropean Research Development Fund -AEI/FEDER, UE- (PSI2015-73156-JIN toE.C.O.; PSI2017-82604R to L.J.S.) and from University of Malaga (Plan Propio 2017 –‘Ayudas para proyectos dirigidos por jóvenes investigadores’, PPIT.UMA.B1.2017/38 toP.S.P).Author P.S.P. holds a ‘Juan de la Cierva-formación’ grant from the Spanish Ministry ofEconomy, Industry and Competitiveness (code: FJCI-2015-23925). Author M.M.P. holdsPredoctoral contract from University of Malaga (Plan Propio 2017). Author F.A.G holdsYoung researchers contract from the University of Malaga co-funded by the RegionalGovernment of Andalusia and the European Social Fund. Author E.C.O holds a ‘JóvenesInvestigadores’ grant (code: PSI2015-73156-JIN) from MINECO-AEI/FEDER, UE.
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 20 ene 2026