Spatial Firing Analysis and Behavioral Correlates
Objective: Describe the positional firing properties of medial entorhinal cortex (MEC) cells and compare them with hippocampal place cells during a pellet retrieval task in geometric enclosures
Gather these items before starting the experiment. Check off items as you prepare.
Equipment3
Materials2
Not specified • Not specified • Not specified • Not specified
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Software1
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Protocol Steps
Animal placement in recording chamber
Rats were placed in simple geometric enclosures (cylinder or square) for behavioral task
Note: Recording chambers were simple geometric shapes to facilitate comparison with hippocampal place cell studies
View evidence from paper
“MEC cells were recorded from rats while they retrieved pellets in simple geometric enclosures”
Pellet retrieval task
Rats performed a behavioral task retrieving pellets within the geometric enclosure while neural activity was recorded
Note: Task design matched previous hippocampal place cell studies to facilitate direct comparison
View evidence from paper
“The behavioral task as well as procedures for data collection and analysis were the same used in previous studies on hippocampal place cells”
Neural recording during behavior
Extracellular recording of medial entorhinal cortex cell firing patterns while rats performed pellet retrieval task
Note: Firing patterns showed improvement in spatial signal with long-duration recordings
View evidence from paper
“MEC firing patterns are stationary in time as evidenced by their reproducibility, and the improvement in spatial signal with long-duration recordings”
Visual cue manipulation
White card visual cue attached to chamber wall was rotated to test control of firing patterns
Note: Firing could be controlled by cue rotation but was not disrupted by cue removal
View evidence from paper
“their firing can be controlled by the rotation of a visual cue (a white card attached to the wall), but is not disrupted by removing the cue”
Chamber shape transition
Recording chamber was changed from cylinder to equal-area square to test environmental discrimination and firing pattern transformation
Note: MEC firing patterns topologically transformed while hippocampal place cell patterns changed unpredictably
View evidence from paper
“In the transition from a cylinder to an equal-area square of similar appearance, MEC firing patterns topologically transformed (or 'stretched') while those of hippocampal place cells changed to an unpredictable pattern”
Data collection and analysis
Positional firing properties were analyzed and compared between MEC and hippocampal cells using standardized procedures
Note: Procedures matched previous hippocampal place cell studies for direct comparison
View evidence from paper
“procedures for data collection and analysis were the same used in previous studies on hippocampal place cells (e.g., Muller et al., 1987)”