Experience induced visual cortical (VC) plasticity is key for adequate pathway maturation and circuitry refinement. Competing inputs from each eye arriving to the thalamic lateral geniculate nucleus and, later, to VC, are necessary to shape and develop visual binocularity. Without such competition, an increased responsiveness and number of binocular cortical neurons has been reported. Here, we investigated monocular stimulation in rats that had been dark reared and compared their cortical BOLD responses with normal reared animals. Increased BOLD responses appeared along the VC of the dark reared group, suggesting a lack of pathway maturation and binocular integration.