Give the mechanism of the reaction shown below. 
Definitions:
Analgesia
The absence of pain in response to stimulation which would normally be painful, often achieved through the use of medication.
Startle Response
A reflex reaction to sudden, unexpected stimuli, such as loud noises, characterized by sudden muscle contractions.
Brachial Nerve Palsy
A condition where the brachial nerve is injured, leading to weakness, numbness, or paralysis of the arm.
Index Finger
The second digit of the human hand, located between the thumb and the middle finger, often used for pointing.
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