 These aspects of attention are thought to involve parietal and temporal cortices, as well as the brainstem.More recent experimental evidence support the idea that the primary visual cortex creates a bottom-up saliency map, which is received by the superior colliculus in the midbrain area to guide attention or gaze shifts.The second aspect is called top-down processing, also known as goal-driven, endogenous attention, attentional control or executive attention.