[1] Univ Texas Austin, Moody Coll Commun, Commun Sci & Disorders, Austin, TX 78712 USA
[2] Univ Texas Austin, Dept Neurol, Dell Med Sch, Austin, TX 78712 USA
[3] Univ Texas Austin, Dept Neurosci, Austin, TX 78712 USA
[4] Univ Texas Austin, Dept Comp Sci, Austin, TX 78712 USA