Lateralization of spatial preference in the female rat

Area of Science:

• Neuroscience
• Developmental Neuroscience
• Behavioral Neuroscience

Background:

• Early life experiences can shape brain development and behavior.
• Sex differences in brain organization and behavioral responses are well-documented.

Purpose of the Study:

• To investigate the impact of early life handling and environmental enrichment on brain organization in female rats.
• To examine the effects of neocortical lesions on open-field behavior in female rats with different early life experiences.

Main Methods:

• Female rat pups were assigned to either undisturbed or handled-enriched rearing conditions.
• Adult rats underwent neocortical ablation (right or left), sham surgery, or no surgery.
• Locomotor activity (left/right movement) was assessed in an open field.

Main Results:

• Nonhandled females exhibited a leftward movement bias, suggesting asymmetrical brain organization.
• Handled-enriched females were unbiased in their movement.
• Neocortical lesions induced ipsilateral movement, with no significant difference between early experience groups.

Conclusions:

• Early life experience differentially affects brain organization in female rats compared to males.
• Environmental factors during development play a crucial role in modulating brain asymmetry and behavior.