Recording from Snail Motor Nerves to Investigate Central Pattern Generation

Area of Science:

• Neuroscience
• Animal Behavior

Background:

• Pond snail feeding is a model for central pattern generation (CPG).
• CPG involves neural circuits in the buccal ganglia controlling feeding movements.
• Understanding CPG modulation is key to comprehending rhythmic behaviors.

Purpose of the Study:

• To provide students with hands-on experience in observing and quantifying feeding behavior in pond snails.
• To investigate the effects of feeding stimulants and neuromodulators on the rhythmic motor activity of snail feeding.
• To facilitate discussion on neural circuitry and intrinsic neuronal properties underlying rhythmic activities.

Main Methods:

• Dissection of pond snail nervous system and feeding apparatus.
• Recording of neural activity from relevant nerves.
• Experimental application of feeding stimulants, serotonin, and dopamine.
• Quantification of rhythmic motor activity, including cyclic measurements and spike-rate analysis.

Main Results:

• Successful observation and recording of pond snail feeding behavior.
• Demonstration of altered rhythmic motor activity in response to feeding stimulants.
• Quantifiable changes in neural activity upon administration of serotonin and dopamine.
• Data suitable for qualitative or quantitative analysis based on course objectives.

Conclusions:

• The pond snail feeding system effectively demonstrates CPG principles.
• Neuromodulators like serotonin and dopamine significantly influence feeding motor patterns.
• This exercise enhances understanding of neural control of rhythmic behaviors like feeding, locomotion, and respiration.