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Attentional processing in hyperthyroid children before and after treatment
Insights
Thyrotoxicosis in children impairs nonverbal intelligence and specific attention functions like shifting and disengaging, but not sustained attention. These deficits improve with treatment, suggesting thyroid hormone effects on the prefrontal cortex.
Area of Science:
- Pediatric Endocrinology
- Neuropsychology
- Cognitive Neuroscience
Background:
- Thyrotoxicosis, a state of excess thyroid hormone, can impact cognitive functions.
- Specific components of attention, including shifting and disengaging, may be vulnerable to thyroid hormone imbalances.
Purpose of the Study:
- To investigate whether specific attentional processing components are differentially disrupted in children with hyperthyroidism.
- To assess the impact of thyroid hormone levels on nonverbal intelligence and attention subcomponents.
Main Methods:
- Nine children with hyperthyroidism were evaluated for intelligence and attention (sustain, disengage, shift) before and after one year of therapy.
- Cognitive assessments were compared to pediatric controls.
- Self-reported anxiety was also measured.
Main Results:
- Children with thyrotoxicosis exhibited lower nonverbal intelligence, which normalized after treatment.
- Attention testing revealed deficits in the shift and disengage functions, but not in sustained attention, during thyrotoxicosis.
- Attention outcomes were not correlated with self-reported anxiety levels.
Conclusions:
- Thyrotoxicosis in children affects specific aspects of attentional processing, particularly those involving shifting and disengaging cognitive resources.
- These findings support the role of thyroid hormones in modulating prefrontal cortex activity, which underlies these attentional functions.
- Treatment leading to euthyroidism restores cognitive functions, highlighting the reversibility of these effects.
Abstract:
To determine whether specific components of attentional processing may be differentially disrupted during thyrotoxicosis, nine children with hyperthyroidism were assessed for intelligence and attention before and after one year of therapy. The attention test allowed for measurement of sustain, disengage, and shift subcomponents of attentional processing. Comparison with pediatric controls revealed lower nonverbal intelligence during thyrotoxicosis, which improved to normal following euthyroidism. On the attention task, an effect was observed during thyrotoxicosis only on the shift and disengage functions of attentional processing but not sustain. Attention results were unrelated to self-reported anxiety at time of testing. Results are discussed in terms of thyroid hormone activation of the prefrontal cortex, which is thought to be the cerebral substrate underlying the shift and disengage functions of attentional processing.