Figure 1
From: Reduced influence of perceptual context in mild traumatic brain injury is not an illusion

Examples of the stimuli used in the no context condition (Panel (a)) and the context condition (Panel (b)). In both conditions, the target circles are the same size. However, in the context condition (Panel (b)), the target circle on the left typically appears smaller than the target circle on the right (Ebbinghaus illusion).