1. While subjects were completing the assigned task, an unexpected visual stimulus was presented. 2. N1 is also sensitive to the manipulation of a visual stimulus 'intensity. 3. The objects appear to provide a " visual stimulus in an optical void ". 4. Each neuron also responded to a visual stimulus near or approaching the tactile receptive field. 5. It was a short visual stimulus , very short. 6. She was hyperreactive to visual stimulus and would often quickly spin around when she got distracted. 7. The superior colliculus and prefrontal cortex also have a major role in awareness of a visual stimulus . 8. For some animals, the sun is a form of visual stimulus used as a tool for navigation. 9. Their memories often contain minor errors, including information that was not present in the original visual stimulus . 10. Vividness and stability of the image begins to fade within minutes after the removal of the visual stimulus .