Which statement about cortical representation is true?

• A. More neurons equate to less sensitivity.
• B. More neurons in a region do not affect sensitivity.
• C. More neurons in a cortical region are associated with greater sensory sensitivity.
• D. Neuronal density only affects motor areas.

Answer: (C)

Cortical representation reflects how much neural real estate a region has to process sensory input. When a sensory area has more neurons dedicated to it, the brain can analyze inputs with greater precision, leading to higher sensory sensitivity or acuity. Think of a fingertip having a large cortical map with dense processing—this lets you distinguish tiny differences in touch—whereas areas with less representation, like the back, are less precise.

That’s why increasing the number of neurons in a cortical region is associated with greater sensory sensitivity. The idea that more neurons would reduce sensitivity goes against how the brain’s map is organized to support fine discrimination. Likewise, neuronal density isn’t limited to motor areas; sensory regions also rely on dense neuronal networks to detect and differentiate stimuli.