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Delayed Alternation Task for the Study of Spatial Working and Long Term Memory in Rats
1Program of Neuroscience and Behavior, Mount Holyoke College, South Hadley, MA, United States.
Bio-Protocol
|March 4, 2021
Summary
This study introduces a delayed alternation task to test spatial working memory (WM) in rats. Longer delays reveal the need for long-term memory beyond sequential neural firing patterns.
Area of Science:
- Neuroscience
- Cognitive Science
- Animal Behavior
Background:
- Memory systems bridge temporal gaps between events.
- Hippocampus and medial entorhinal cortex (mEC) are crucial for memory retention over delays.
- Alternation tasks assess spatial working memory (WM).
Purpose of the Study:
- To describe a delayed alternation task protocol.
- To investigate spatial working memory (WM) under extended delay conditions.
- To explore memory mechanisms beyond sequential neuronal firing.
Main Methods:
- Developed a figure-8 maze delayed alternation task.
- Manipulated WM load by varying delay intervals (10s and 60s).
- Rats alternated left/right turns based on previous trial memory.
Main Results:
- The task requires rats to remember and reverse their previous direction.
- Extended delays (60s) challenge WM capacity.
- Longer delays may engage long-term memory resources.
Conclusions:
- The delayed alternation task effectively probes spatial WM.
- Extended delays necessitate memory strategies beyond immediate sequential processing.
- This paradigm may differentiate memory systems supporting short-term vs. long-term recall.
