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Juvenile play in the rat: thalamic and brain stem involvement
1Department of Psychology, Bowling Green State University, OH 43403.
Physiology & Behavior
|January 1, 1987
Summary
Lesions in specific thalamic and brain stem areas reduced pinning behavior in juvenile rats, indicating a role in social play. Motivation to play remained largely unaffected, suggesting targeted neural pathways for play execution.
Area of Science:
- Neuroscience
- Behavioral Neuroscience
- Animal Behavior
Background:
- Rough-and-tumble play is crucial for social development in juvenile mammals.
- The neural circuits underlying the execution of playful behaviors are not fully understood.
Purpose of the Study:
- To investigate the role of specific thalamic and brain stem areas in mediating pinning, a key component of rough-and-tumble play in rats.
- To differentiate the neural control of play execution from the motivation to engage in play.
Main Methods:
- Discrete electrolytic lesions were made in the parafascicular area of the thalamus (PFA), posterior thalamic area (TP), ventrobasal thalamic area (VBT), and ventrolateral brain stem in juvenile rats.
- Behavioral assays were used to measure the frequency of pinning and play solicitation, assessing both play execution and motivation.
Main Results:
- Lesions in the PFA, TP, and ventrolateral brain stem significantly reduced pinning frequency.
- Lesions in these areas did not significantly affect motivation to play.
- Lesions in the VBT showed minimal impact on both pinning and play motivation.
Conclusions:
- Specific thalamic (PFA, TP) and brain stem regions appear critical for the execution of pinning behavior during play.
- These neural areas may be involved in processing somatic stimuli essential for initiating and executing playful actions.
- The findings suggest a dissociation between the neural control of play execution and play motivation.