The device pictured is a presence-sensing device.
Definitions:
Ganglion Cells
Type of neurons located in the retina that receive visual information from photoreceptor cells and transmit it to the brain.
Optic Nerve
A cranial nerve that transmits visual information from the retina to the brain.
Visual Receptors
Cells located in the retina of the eye that are responsible for converting light into neural signals which enable vision.
Gate Theory Of Pain
A theory suggesting that the spinal cord contains a neurological "gate" that either blocks pain signals or allows them to continue on to the brain, influenced by physical, emotional, and cognitive factors.
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