Time- but not sleep-dependent consolidation promotes the emergence of cross-modal conceptual representations

Hennies, Nora and Lewis, Penelope A. and Durrant, Simon J. and Cousins, James and Lambon Ralph, Matthew A. (2014) Time- but not sleep-dependent consolidation promotes the emergence of cross-modal conceptual representations. Neuropsychologia, 63 . pp. 116-123. ISSN 0028-3932

Full content URL: http://dx.doi.org/10.1016/j.neuropsychologia.2014....

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Abstract

Conceptual knowledge about objects comprises a diverse set of multi-modal and generalisable information, which allows us to bring meaning to the stimuli in our environment. The formation of conceptual representations requires two key computational challenges: integrating information from different sensory modalities and abstracting statistical regularities across exemplars. Although these processes are thought to be facilitated by offline memory consolidation, investigations into how cross-modal concepts evolve offline, over time, rather than with continuous category exposure are still missing. Here, we aimed to mimic the formation of new conceptual representations by reducing this process to its two key computational challenges and exploring its evolution over an offline retention period. Participants learned to distinguish between members of two abstract categories based on a simple one-dimensional visual rule. Underlying the task was a more complex hidden indicator of category structure, which required the integration of information across two sensory modalities. In two experiments we investigated the impact of time- and sleep-dependent consolidation on category learning. Our results show that offline memory consolidation facilitated cross-modal category learning. Surprisingly, consolidation across wake, but not across sleep showed this beneficial effect. By demonstrating the importance of offline consolidation the current study provided further insights into the processes that underlie the formation of conceptual representations.

Additional Information:Open Access funded by Biotechnology and Biological Sciences Research Council
Keywords:Abstraction,Category learning,Cross-modal object representations,Memory consolidation,Sleep,memory consolidation, NotOAChecked
Subjects:B Subjects allied to Medicine > B140 Neuroscience
C Biological Sciences > C850 Cognitive Psychology
Divisions:College of Social Science > School of Psychology
ID Code:17789
Deposited On:09 Jul 2015 14:19

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