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How does surround inhibition sharpen the ability to locate touch?

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Meissner's corpuscle; mechanoreception — Mechanoreception In human skin, specialized nerve endings known as Meissner's corpuscles (or tactile corpuscles) are sensitive to touch. They are one of several different types of mechanoreceptors found in human skin.

Surround inhibition is a critical neural mechanism that enhances the precision of sensory perception, including the sense of touch. By creating an inhibitory area around a central excited area, the nervous system effectively accentuates the signal from the specific point of stimulation.1

This process works by suppressing the activity of neurons surrounding the primary site of excitation. Because the inhibitory effect reduces the response in the periphery while the central area remains active, the contrast between the stimulated point and its surroundings is significantly increased. This enhancement of contrast allows the brain to distinguish the precise location of a stimulus more effectively than it could through excitation alone, thereby sharpening sensory discrimination.1

While this mechanism is perhaps most famously studied in the retina to improve visual acuity, it is a fundamental principle of sensory processing that applies to mechanoreceptors in the skin, helping to refine our ability to localize mechanical pressure and touch.1