Question

SAQ2. Two Point Discrimination Threshold (TDP) Assessment: A. What effect do you predict a thin barrier (such as your volunteer wearing a latex glove) would have on the TPD threshold of the fingertip (0.5 marks)? B. What are the probable neural mechanisms for such a difference (0.5 marks)?

Answer 1

A. Thin barrier on TPD thresold on fingertips produces effects such as :- intact cutaneous sensation and propriception.

1. The density of skin sensory receptors

2. Connection that sensory nerve cells make in brain.

3. Finger top have high resolution.  

Illustrated as distance where two points can be felt as separate. Normally person should able to recognise two points separated by 2 to 8 mm on fingertips.  

The face and the hands have best spatial discrimination thresolds.

B. TPD that is two point discrimination which is most commonly used to test neurosensory .

NEURAL MECHANISM :- TPD have the ability to discern that the nearby objects touching skin are nearly two distinct point.

It is often tested with two sharp point during a neurological testing.

Two points evoke a different number of action potential. Two point distinguished from one.

A tactile sensory receptors as peripheral ending of a sensory neuron and its accessory structure.