The Neural Control of Visually Guided Eye Movements
C. Cortical Mechanisms of Visually Guided Saccadic Eye Movements

Figure 15 shows how the experiment was conducted: After advancing a microelectrode into a given cortical area, the receptive field of the neurons at the tip of the electrode was mapped out. This was accomplished by moving a bar of light around while the monkey maintained fixation as shown in #1 of this figure. We then electrically stimulated to generate a saccadic eye movement as shown in #2. This shifted the center of gaze into the receptive or motor field of the neurons stimulated. A target was then placed at this site (#3); proper placement meant that the saccades elicited by the target had the same vector as those elicited by electrical stimulation. We then proceeded to present the paired targets with various temporal asynchronies that were on some trials coupled with electrical stimulation (#4). One of the targets was placed within the receptive or motor field.