Functional cerebral lateralization and interhemispheric interaction in patients with callosal agenesis
| Autor: | Anna Ball, Sebastian Ocklenburg, Erhan Genç, Claudia C. Wolf, Onur Güntürkün |
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| Rok vydání: | 2015 |
| Předmět: |
Male
Corpus callosum Functional Laterality Lateralization of brain function Dichotic Listening Tests Developmental psychology Surveys and Questionnaires Reaction Time medicine Humans Language Dichotic listening Brain Cognition Human brain Commissure medicine.disease Magnetic Resonance Imaging Diffusion Tensor Imaging Neuropsychology and Physiological Psychology medicine.anatomical_structure Agenesis Female Agenesis of Corpus Callosum Visual Fields Tomography X-Ray Computed Psychology Neuroscience Commissural fiber Algorithms Psychomotor Performance |
| Zdroj: | Neuropsychology. 29:806-815 |
| ISSN: | 1931-1559 0894-4105 |
| DOI: | 10.1037/neu0000193 |
| Popis: | Objective The corpus callosum (CC), the largest commissure in the human brain, is thought to play an essential part in the formation and maintenance of lateralized cognitive and motor functions. In particular, it has been suggested that inhibition of the subdominant hemisphere via commissural fiber tracts plays a crucial role for functional lateralization. However, many studies supporting this idea have either been conducted in nonhuman model species or used indirect measures of callosal functioning. Method In order to directly assess the impact of the presence or absence of the CC on both the existence and the extent of functional hemispheric asymmetries, we investigated handedness and language lateralization, as well as interhemispheric information integration, in 6 high-functioning individuals with partial or complete agenesis of the CC (AgCC). Performance was compared with that of 30 IQ- and age-matched controls with intact CC. Results We found a stronger predisposition for ambidexterity in individuals with AgCC. Similarly, the typical right ear advantage in the dichotic listening task was significantly reduced in AgCC. Furthermore, AgCC patients generally reacted slower than controls in a test of interhemispheric information integration, and showed reduced accuracy in trials that required interhemispheric integration. Conclusions These findings indicate that reduced hemispheric specialization in the acallosal brain might be due to a higher degree of hemispheric autonomy in AgCC. |
| Databáze: | OpenAIRE |
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