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Published on: March 28, 2012
Traces of experience in the lateral entorhinal cortex
Albert Tsao1, May-Britt Moser, Edvard I Moser
1Kavli Institute for Systems Neuroscience and Centre for Neural Computation, Norwegian University of Science and Technology, 7489 Trondheim, Norway. albert.tsao@ntnu.no.
Current Biology : CB
|February 26, 2013
Summary
Neurons in the lateral entorhinal cortex (LEC) can remember object locations. Some LEC cells track past object experiences, forming object-trace cells crucial for object-place memory.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Memory Research
Background:
- The hippocampus integrates spatial and nonspatial information for memory storage.
- Lateral entorhinal cortex (LEC) neurons are implicated in representing environmental content.
- It remains unclear if LEC object-evoked firing relies solely on sensory input or past experience.
Purpose of the Study:
- To investigate whether lateral entorhinal cortex (LEC) neurons encode object presence based on past experience.
- To differentiate between sensory-driven object responses and experience-dependent place firing in the LEC.
Main Methods:
- Electrophysiological recordings from LEC neurons in rats navigating an open-field environment.
- Introduction of discrete objects in a subset of trials.
- Analysis of neuronal firing patterns in relation to object presence and previous object locations.
Main Results:
- Some LEC neurons fired in the presence of objects (object cells).
- Other LEC neurons fired at locations where objects had been previously placed, independent of current object presence (object-trace cells).
- Object-trace cells demonstrated a readout of past experience, distinct from sensory-driven responses.
Conclusions:
- The lateral entorhinal cortex (LEC) contains distinct cell classes for processing current object stimuli and past object-associated locations.
- These findings highlight the LEC's role in forming object-place memories.
- LEC contributes to the hippocampal-cortical circuit by encoding both spatial context and object-related experiential information.
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