An Undergraduate Laboratory Exercise that Demonstrates the Difference Between Peripherally and Centrally Mediated...

Area of Science:

• Neuroscience
• Sensory Systems Biology
• Physiology

Background:

• The nervous system is divided into the Peripheral Nervous System (PNS) and Central Nervous System (CNS).
• This division is crucial for processing external environmental information within sensory systems.
• Understanding the distinct roles of PNS and CNS is fundamental in neuroscience education.

Purpose of the Study:

• To elucidate the differential roles of the PNS and CNS in sensory information processing.
• To provide students with a practical understanding of nervous system organization through a laboratory exercise.
• To introduce fundamental concepts of quantitative sensory testing.

Main Methods:

• Development of a simple in-class laboratory exercise for neuroscience students.
• Utilizing quantitative sensory testing methods to assess discriminative capacity (threshold, amplitude, duration discrimination).
• Manipulating peripheral nervous system (PNS) sensitivity via cold water immersion to observe effects on sensory perception.

Main Results:

• The laboratory exercise effectively demonstrated the functional differences between the PNS and CNS in sensory processing.
• Students gained a foundational understanding of quantitative sensory testing principles.
• Altering skin sensitivity (PNS) demonstrably affected sensory discrimination thresholds.

Conclusions:

• The study provides a clear, hands-on method for teaching the fundamental organization and function of the nervous system.
• Students achieve a comprehensive grasp of PNS vs. CNS roles in sensory information integration.
• This foundational knowledge prepares students for advanced study in sensory information processing.