In the pulse-step model, which statement describes the pulse component?

• A. It holds the eye in eccentric position after movement.
• B. It encodes accuracy of movement.
• C. It initiates movement.
• D. It determines the velocity of the eye movement.

Answer: (D)

In the pulse-step model, the pulse is a brief, phasic neural burst that drives the eye movement. Its amplitude (and duration) primarily sets how fast the eye moves—the peak velocity of the saccade. After the movement, the step signal holds the eye in the new position. So the pulse component is best described as determining the velocity of the eye movement.