The first phase of the experiment was undertaken to examine the response changes that occur when a subject learns to track a repeating sequence that is embedded in a stimulus signal. The subject's tracking performance as measured by consistency and time-lag indices improved despite having no reportable knowledge of the repeating segment of the stimulus signal. The second phase investigated the perceptual changes that accompany the learning of the tracking task. It appeared that a subject's perception of the speed of a stimulus sequence while tracking varied depended upon the familiarity of the specific pattern of movements that comprised the signal.
