Source Paper
When Is the Hippocampus Involved in Recognition Memory?
G. R. I. Barker, E. C. Warburton
Journal of Neuroscience • 2011
View Abstract
The role of the hippocampus in recognition memory is controversial. Recognition memory judgments may be made using different types of information, including object familiarity, an object's spatial location, or when an object was encountered. Experiment 1 examined the role of the hippocampus in recognition memory tasks that required the animals to use these different types of mnemonic information. Rats with bilateral cytotoxic lesions in the hippocampus or perirhinal or prefrontal cortex were tested on a battery of spontaneous object recognition tasks requiring the animals to make recognition memory judgments using familiarity (novel object preference); object-place information (object-in-place memory), or recency information (temporal order memory). Experiment 2 examined whether, when using different types of recognition memory information, the hippocampus interacts with either the perirhinal or prefrontal cortex. Thus, groups of rats were prepared with a unilateral cytotoxic lesion in the hippocampus combined with a lesion in either the contralateral perirhinal or prefrontal cortex. Rats were then tested in a series of object recognition memory tasks. Experiment 1 revealed that the hippocampus was crucial for object location, object-in-place, and recency recognition memory, but not for the novel object preference task. Experiment 2 revealed that object-in-place and recency recognition memory performance depended on a functional interaction between the hippocampus and either the perirhinal or medial prefrontal cortices. Thus, the hippocampus plays a role in recognition memory when such memory involves remembering that a particular stimulus occurred in a particular place or when the memory contains a temporal or object recency component.
Unilateral Contralateral Lesion Study
Objective: Examine functional interactions between brain regions using unilateral hippocampal lesions combined with contralateral perirhinal or prefrontal cortex lesions to determine when the hippocampus is involved in recognition memory
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Materials1
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Protocol Steps
Surgical preparation of lesions
Prepare groups of rats with unilateral cytotoxic lesion in the hippocampus combined with a lesion in either the contralateral perirhinal or prefrontal cortex
Note: Lesions are unilateral in hippocampus and contralateral in perirhinal or prefrontal cortex
View evidence from paper
“groups of rats were prepared with a unilateral cytotoxic lesion in the hippocampus combined with a lesion in either the contralateral perirhinal or prefrontal cortex”
Behavioral testing on object recognition memory tasks
Test rats in a series of object recognition memory tasks following lesion preparation
Note: Tasks assess different types of recognition memory information
View evidence from paper
“Rats were then tested in a series of object recognition memory tasks”
Assessment of object-in-place memory
Test recognition memory requiring animals to use object-place information
Note: Part of battery of spontaneous object recognition tasks
View evidence from paper
“object-in-place memory, or recency information (temporal order memory)”
Assessment of recency recognition memory
Test recognition memory requiring animals to use recency information and temporal order
Note: Part of battery of spontaneous object recognition tasks
View evidence from paper
“recency information (temporal order memory)”