Find the differential of the function. 
Definitions:
Electrical Activity
Movements of ions that create electrical signals, which are fundamental for the functioning of nervous systems and muscle contractions.
James-Lange Theory
A theory of emotion proposing that physiological arousal precedes the experience of emotion.
Spinal Cord Injuries
Damage to the spinal cord that results in a loss of function, such as mobility or sensation.
Conscious Experience
The awareness of one's thoughts, feelings, and environment at any given moment, central to notions of self and perception.
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