Could it be that distant tribal villages didn't go through the same type of evolution and their brains didn't develop specific receptors in their visual field/c

Could it be that distant tribal villages didn't go through the same type of evolution and their brains didn't develop specific receptors in their visual field/cortex to detect nipples and bind them to the reward system in the brain? We know that even a single neuron in visual cortex can detect complex objects shapes like animals, who tells us that we didn't develop a specialized nipple detector neuron linked directly to the reward center while Papuan tribes didn't?