What is the security guard cell?

The security guard cell is a specialized type of cell found in the brain, particularly in the retina, that plays a crucial role in visual processing. It acts as a gatekeeper, selectively allowing certain signals to pass through while inhibiting others, thus enhancing contrast and clarity in visual perception. This mechanism helps the brain filter out irrelevant information and focus on important visual cues. By doing so, security guard cells contribute to our ability to detect motion and changes in our visual environment effectively.