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Interhemispheric interaction during childhood: II. Children with early-treated phenylketonuria
M T Banich1, A M Passarotti, D A White
1Beckman Institute, Department of Psychology, University of Illinois at Urbana-Champaign, USA. mbanich@psych.colorado.edu
Insights
Children with early-treated phenylketonuria (ETPKU) show impaired interhemispheric communication, especially on complex tasks. This neural inefficiency may contribute to attention deficits in ETPKU.
Area of Science:
- Neuroscience
- Developmental Psychology
- Genetics
Background:
- Phenylketonuria (PKU) affects brain myelination, potentially impacting the corpus callosum and interhemispheric communication.
- Early treatment of PKU (ETPKU) aims to mitigate neurological consequences.
- Understanding interhemispheric interaction is crucial for cognitive development.
Purpose of the Study:
- To investigate interhemispheric communication differences in children with ETPKU compared to neurologically intact children.
- To assess the impact of computational complexity on interhemispheric interaction in ETPKU.
- To explore the link between compromised interhemispheric communication and attentional deficits in ETPKU.
Main Methods:
- Compared children with ETPKU and age/IQ-matched controls.
- Administered two tasks varying in computational complexity: physical-identity (less complex) and name-identity (more complex).
- Analyzed performance on across-hemisphere (requiring interaction) versus within-hemisphere (no interaction) trials.
Main Results:
- Children with ETPKU showed less benefit from across-hemisphere processing on the complex name-identity task compared to controls.
- Performance differences were more pronounced on the name-identity task, indicating a complexity-dependent deficit.
- ETPKU group did not benefit as much from interhemispheric interaction.
Conclusions:
- Interhemispheric interaction is compromised in children with ETPKU, particularly for computationally complex tasks.
- This neural inefficiency may underlie observed attentional deficits in individuals with ETPKU.
- Findings highlight the importance of corpus callosum function in cognitive processing for ETPKU.
Abstract:
This study examined whether children with early-treated phenylketonuria (ETPKU) exhibited a disruption in communication between the hemispheres as a function of computational complexity (Banich & Belger, 1990; Belger & Banich, 1992, 1998) when compared to neurologically uncompromised children who were matched in age and IQ. This investigation was motivated by findings that phenylketonuria affects myelination of neurons, including those that make up the corpus callosum, the main neural conduit for interhemispheric interaction. Children performed 2 tasks: a less complex physical-identity task and a more complex name-identity task. For both tasks, we compared performance on across-hemisphere trials, which require interhemispheric interaction, and on within-hemisphere trials, in which no hemispheric interaction is required. On the more complex name-identity task, children with ETPKU exhibited less of a benefit from across-hemisphere processing than did neurologically intact children. These results suggest that the interhemispheric interaction required to complete computationally complex tasks is compromised in children with ETPKU. Such an insufficiency may explain some of the attentional deficits observed in this group of children.