Awake hippocampal sharp-wave ripples support spatial memory

Science. 2012 Jun 15;336(6087):1454-8. doi: 10.1126/science.1217230. Epub 2012 May 3.


The hippocampus is critical for spatial learning and memory. Hippocampal neurons in awake animals exhibit place field activity that encodes current location, as well as sharp-wave ripple (SWR) activity during which representations based on past experiences are often replayed. The relationship between these patterns of activity and the memory functions of the hippocampus is poorly understood. We interrupted awake SWRs in animals learning a spatial alternation task. We observed a specific learning and performance deficit that persisted throughout training. This deficit was associated with awake SWR activity, as SWR interruption left place field activity and post-experience SWR reactivation intact. These results provide a link between awake SWRs and hippocampal memory processes, which suggests that awake replay of memory-related information during SWRs supports learning and memory-guided decision-making.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Brain Waves / physiology*
  • CA1 Region, Hippocampal / physiology*
  • Decision Making
  • Electric Stimulation
  • Hippocampus / physiology*
  • Male
  • Maze Learning
  • Memory / physiology*
  • Memory, Short-Term
  • Nerve Net / physiology
  • Rats
  • Rats, Long-Evans
  • Space Perception
  • Synaptic Potentials
  • Wakefulness / physiology*