Oral behaviour following forebrain ablations in Gallus Domesticus.

Area of Science:

• Neuroscience
• Animal Behavior
• Avian Biology

Background:

• Oral behaviors are complex responses to stimuli.
• Understanding the neural control of oral behaviors is crucial for comparative neurobiology.
• Previous research has explored oral behavior control in mammals.

Purpose of the Study:

• To investigate the neural control of specific oral behaviors in Brown Leghorn hens.
• To determine the brain regions responsible for beak wiping, head shaking, and beak/tongue movements.
• To compare the findings with existing knowledge on oral behavior control in mammals.

Main Methods:

• Adult Brown Leghorn hens were used as subjects.
• Oral stimulation was administered using water, sodium chloride, acetic acid, and quinine hydrochloride.
• Surgical ablation of the anterior telencephalon or the entire telencephalon and/or diencephalon was performed.
• Oral behaviors were recorded before and after surgical interventions.

Main Results:

• Beak wiping behavior was abolished by anterior telencephalon removal.
• Head shaking behavior was abolished only by complete forebrain removal (telencephalon and diencephalon).
• Beak and tongue movements persisted even after forebrain removal.

Conclusions:

• Distinct brain areas control different components of oral behavior in hens.
• The anterior telencephalon is critical for beak wiping.
• The entire forebrain is necessary for head shaking, while basic oral movements are more resilient to forebrain ablation.