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Effects of entorhinal cortex lesions on memory in different tasks
G P Gutierrez-Figueroa1, C Dalmaz, I Izquierdo
1Departamento de Bioquímica, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brasil.
Summary
Bilateral entorhinal cortex lesions in rats impaired memory in shuttle avoidance and inhibitory avoidance tasks, but not open field tasks. This suggests the entorhinal cortex
Area of Science:
- Neuroscience
- Cognitive Psychology
- Animal Behavior
Background:
- The entorhinal cortex is crucial for memory processing.
- Lesions in this area are known to cause retrograde memory impairment.
Purpose of the Study:
- To investigate the effects of entorhinal cortex lesions on different memory tasks.
- To determine if the timing of lesions (pre- or post-training) influences memory impairment.
Main Methods:
- Bilateral entorhinal cortex lesions were induced using N-methyl-D-aspartate (NMDA) infusion in rats.
- Rats were trained on three tasks: two-way shuttle avoidance, inhibitory avoidance, and open field habituation.
- Lesions were administered either before or after the training sessions.
Main Results:
- Pre- or post-training entorhinal cortex lesions impaired performance in the shuttle avoidance task.
- Post-training lesions, but not pre-training lesions, caused amnesia in the inhibitory avoidance task.
- No significant effect on memory was observed in the open field habituation task.
Conclusions:
- The entorhinal cortex's role in memory processing is task-dependent.
- Memory impairment resulting from entorhinal cortex lesions may be related to the cognitive complexity of the task.