ERIC Number: EJ874478
Record Type: Journal
Publication Date: 2010-Jan
Abstractor: As Provided
Reference Count: 0
Object Recognition Memory and the Rodent Hippocampus
Broadbent, Nicola J.; Gaskin, Stephane; Squire, Larry R.; Clark, Robert E.
Learning & Memory, v17 n1 p5-11 Jan 2010
In rodents, the novel object recognition task (NOR) has become a benchmark task for assessing recognition memory. Yet, despite its widespread use, a consensus has not developed about which brain structures are important for task performance. We assessed both the anterograde and retrograde effects of hippocampal lesions on performance in the NOR task. Rats received 12 5-min exposures to two identical objects and then received either bilateral lesions of the hippocampus or sham surgery 1 d, 4 wk, or 8 wk after the final exposure. On a retention test 2 wk after surgery, the 1-d and 4-wk hippocampal lesion groups exhibited impaired object recognition memory. In contrast, the 8-wk hippocampal lesion group performed similarly to controls, and both groups exhibited a preference for the novel object. These same rats were then given four postoperative tests using unique object pairs and a 3-h delay between the exposure phase and the test phase. Hippocampal lesions produced moderate and reliable memory impairment. The results suggest that the hippocampus is important for object recognition memory.
Descriptors: Surgery, Neurology, Recognition (Psychology), Novelty (Stimulus Dimension), Animal Behavior, Brain Hemisphere Functions, Memory, Animals, Neurological Impairments
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Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Authoring Institution: N/A