ON–OFF retinotopy measured along 0.3 mm of horizontal cortical distance in macaque primary visual cortex (n = 1 monkey). As in the cat, changes in OFF retinotopy are more restricted than changes in ON retinotopy in the receptive fields of both eyes. Panels labelled ‘average’ show receptive fields averaged across cortical distance separately for each eye and both eyes. Plots labelled ‘retinotopy’ show the retinotopy of the receptive field pixel that generated the strongest ON (red) or OFF (blue) response, shown separately for each eye and both eyes. Each square box framing a receptive field has a side of 12°.