The corpus callosum, rostrum, and the anterior mid-body sections are larger in adults who stutter as compared to normally fluent adults. This difference may be due to unusual functions of brain organization in stuttering adults and may be a result of how the stuttering adults performed language-relevant tasks. Furthermore, previous research has found that adults who stutter show cerebral hemispheres that contain uncommon brain proportions and allocations of gray and white matter tissue.[39]