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A stable home-base promotes allocentric memory representations of episodic-like everyday spatial memory. Broadbent, Nicola Lumeij, Lucas Berend Corcoles, Marta Ayres, Alice I Bin Ibrahim, Mohammad Zaki Masatsugu, Brittany Moreno, Andrea Caramés-Tejedor, José María Begg, Elizabeth Strickland, Lauren Mazidzoglou, Theofilos Padanyi, Anna Munoz-Lopez, Monica Takeuchi, Tomonori Peters, Marco Morris, Richard RGM Tse, Dorothy Munoz-Lopez, Monica Hipocampo (Cerebro) Memoria A key issue in neurobiological studies of episodic-like memory is the geometric frame of reference in which memory traces of experience are stored. Assumptions are sometimes made that specific protocols favour either allocentric (map-like) or egocentric (body-centred) representations. There are, however, grounds for suspect- ing substantial ambiguity about coding strategy, including the necessity to use both frames of reference occasionally, but tests of memory representation are not rou- tinely conducted. Using rats trained to find and dig up food in sandwells at a par- ticular place in an event arena (episodic-like 'action-where' encoding), we show that a protocol previously thought to foster allocentric encoding is ambiguous but more predisposed towards egocentric encoding. Two changes in training protocol were examined with a view to promoting preferential allocentric encoding—one in which multiple start locations were used within a session as well as between sessions; and another that deployed a stable home-base to which the animals had to carry food re- ward. Only the stable home-base protocol led to excellent choice performance which rigorous analyses revealed to be blocked by occluding extra-arena cues when this was done after encoding but before recall. The implications of these findings for studies of episodic-like memory are that the representational framework of memory at the start of a recall trial will likely include a path direction in the egocentric case but path destination in the allocentric protocol. This difference should be observable in single-unit recording or calcium-imaging studies of spatially-tuned cells. 2024-09-26T06:44:39Z 2024-09-26T06:44:39Z 2020-01-16 journal article Broadbent, N., Lumeij, L. B., Corcoles, M., Ayres, A. I., bin Ibrahim, M. Z., Masatsugu, B., Moreno, A., Carames, J., Begg, E., Strickland, L., Mazidzoglou, T., Padanyi, A., Munoz-Lopez, M., Takeuchi, T., Peters, M., Morris, R. G. M., & Tse, D. (2020). A stable home‐base promotes allocentric memory representations of episodic‐like everyday spatial memory. European Journal of Neuroscience, 51(7), 1539–1558. https://hdl.handle.net/10630/33342 10.1111/ejn.14681 eng http://creativecommons.org/licenses/by/4.0/ open access Attribution 4.0 Internacional European Journal of Neuroscience, Wiley