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Effects of parafascicular electrical stimulation and lesion upon two-way active avoidance in rats
G Guillazo-Blanch1, M Martí-Nicolovius, A Vale-Martínez
1Departament de Psicologia de la Salut, Universitat Autònoma de Barcelona, Spain.
Neurobiology of Learning and Memory
|November 1, 1995
Summary
The parafascicular nucleus (PF) plays a role in learning new avoidance behaviors and retaining them long-term. Lesioning the PF impaired learning, while stimulation after training did not significantly impact retention.
Area of Science:
- Neuroscience
- Behavioral Neuroscience
Background:
- The parafascicular nucleus (PF) is a key component of the thalamus.
- Its role in learning and memory, particularly in active avoidance tasks, remains to be fully elucidated.
Purpose of the Study:
- To investigate the parafascicular nucleus's (PF) role in acquiring and retaining two-way active avoidance behaviors.
- To assess the effects of post-training PF intracranial electrical stimulation (PF ICS) and pre-training PF lesions on learning and memory.
Main Methods:
- Two experiments were conducted on male Wistar rats.
- Experiment I involved post-training PF ICS (10 or 5 min) and control groups.
- Experiment II examined pre-training PF electrolytic lesions and post-training PF ICS at a lower intensity.
Main Results:
- Unexpectedly, a control group receiving pre-training stimulation for current intensity search showed impaired performance, likely due to PF tissue lesion.
- Pre-training PF lesions significantly decreased avoidance conditioning.
- Post-training PF ICS did not affect task acquisition or retention.
Conclusions:
- The parafascicular nucleus (PF) appears to modulate the acquisition of distributed two-way active avoidance.
- The PF may also contribute to the post-training consolidation of these memories.