The integration center of a reflex arc, typically located within the spinal cord or brainstem, is responsible for processing and interpreting the incoming sensory signals. It receives input from the sensory neuron and formulates an appropriate response by activating the motor neuron. This step is crucial because it coordinates the reflex action without conscious brain involvement, allowing for rapid and automatic responses to stimuli. Understanding the integration center is essential for diagnosing and managing neurological deficits affecting reflex pathways.

Reference: Guyton and Hall Textbook of Medical Physiology, Arthur C. Guyton, 13th Edition.