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.
Object-in-Place Memory Task
Objective: To examine the role of the hippocampus in recognition memory tasks requiring animals to use different types of mnemonic information, specifically testing object-in-place memory where animals must remember the spatial location of objects
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Protocol Steps
Lesion creation
Bilateral cytotoxic lesions were created in the hippocampus, perirhinal cortex, or prefrontal cortex in different groups of rats
Note: Experiment 2 also included unilateral hippocampal lesions combined with contralateral lesions in perirhinal or prefrontal cortex
View evidence from paper
“Rats with bilateral cytotoxic lesions in the hippocampus or perirhinal or prefrontal cortex were tested on a battery of spontaneous object recognition tasks”
Object-in-place memory task
Animals were tested on object-in-place memory task requiring recognition memory judgments using object-place information
Note: This task requires animals to remember the spatial location of objects
View evidence from paper
“object–place information (object-in-place memory), or recency information (temporal order memory)”
Spontaneous object recognition testing
Rats were tested in a series of object recognition memory tasks including novel object preference, object-in-place, and temporal order memory tasks
Note: Testing was conducted as a battery of spontaneous object recognition tasks
View evidence from paper
“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”