On an ocular dominance histogram, which column has equal input from each eye?

On an ocular dominance histogram, which column has equal input from each eye?

• A. 1
• B. 2
• C. 4
• D. 7

Answer: (C)

The key idea is that ocular dominance histograms show how strongly neurons in the visual cortex respond to each eye. Columns toward the edges represent stronger input from one eye, while the center column represents balanced input from both eyes. In a seven-column histogram, the middle column (the fourth) is the equal-input column, where neurons respond equally to both eyes. That’s why column four is the correct choice. The outer columns indicate increasing dominance by one eye or the other, so they do not show equal input.

The key idea is that ocular dominance histograms show how strongly neurons in the visual cortex respond to each eye. Columns toward the edges represent stronger input from one eye, while the center column represents balanced input from both eyes. In a seven-column histogram, the middle column (the fourth) is the equal-input column, where neurons respond equally to both eyes. That’s why column four is the correct choice. The outer columns indicate increasing dominance by one eye or the other, so they do not show equal input.