Individuals with a smaller primary visual cortex perceived a much more pronounced visual illusion than those individuals with a larger visual cortex. (scientificamerican.com)
Task Difficulty Modulates the Activity of Specific Neuronal Populations in Primary Visual Cortex. (scientificamerican.com)
In humans, microstimulation of primary visual cortex has been shown to induce phosphenes (Schmidt et al., 1996), and microstimulation of the substantia nigra can influence reinforcement learning (Ramayya et al., 2014). (elifesciences.org)