ERIC Number: EJ1051627
Record Type: Journal
Publication Date: 2015-Feb
Abstractor: As Provided
Reference Count: N/A
Hippocampus, Perirhinal Cortex, and Complex Visual Discriminations in Rats and Humans
Hales, Jena B.; Broadbent, Nicola J.; Velu, Priya D.; Squire, Larry R.; Clark, Robert E.
Learning & Memory, v22 n2 p83-91 Feb 2015
Structures in the medial temporal lobe, including the hippocampus and perirhinal cortex, are known to be essential for the formation of long-term memory. Recent animal and human studies have investigated whether perirhinal cortex might also be important for visual perception. In our study, using a simultaneous oddity discrimination task, rats with perirhinal lesions were impaired and did not exhibit the normal preference for exploring the odd object. Notably, rats with hippocampal lesions exhibited the same impairment. Thus, the deficit is unlikely to illuminate functions attributed specifically to perirhinal cortex. Both lesion groups were able to acquire visual discriminations involving the same objects used in the oddity task. Patients with hippocampal damage or larger medial temporal lobe lesions were intact in a similar oddity task that allowed participants to explore objects quickly using eye movements. We suggest that humans were able to rely on an intact working memory capacity to perform this task, whereas rats (who moved slowly among the objects) needed to rely on long-term memory.
Descriptors: Brain Hemisphere Functions, Animals, Eye Movements, Task Analysis, Short Term Memory, Long Term Memory, Visual Perception, Visual Discrimination, Patients, Neurological Impairments
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Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Authoring Institution: N/A