Executive Functioning in Individuals with Agenesis of the Corpus Callosum: Results of a Sorting Task
The impact of agenesis of the corpus callosum on executive functioning is not entirely clear. The purpose of this study was to examine the role of the corpus callosum in executive functioning tasks involving initiation, concept formation, cognitive flexibility, and problem solving. The Delis-Kaplan Executive Function System (D-KEFS) Sorting Test was given to 27 adults with partial and complete agenesis of the corpus callosum (AgCC). Individuals with AgCC were compared to 57 age- and full-scale intelligence quotient-matched neurotypical adult controls from the D-KEFS control database, as well as compared to test norms. When compared to the expected normative scaled scores, individuals with AgCC did not differ significantly with regard to independently sorting the cards or describing their sorted cards, but they performed significantly worse at naming the sorting patterns produced by the examiner. When controlled for full-scale IQ, AgCC participants performed lower on most sorting scores than age- and IQ-matched controls. When compared to one another, individuals with complete and partial AgCC were not significantly different, likely due to small partial AgCC sample size. However, individuals with partial AgCC outperformed both the control group and individuals with complete AgCC on most subtests.
Doctor of Philosophy in Clinical Psychology (PhD)
Brown, Warren S.
Executive functions, Corpus callosum, Agenesis of corpus callosum, Cognitive neuroscience