Cognitive evaluation in children and adolescents with Möbius sequence.

Area of Science:

• Neurology
• Pediatrics
• Developmental Psychology

Background:

• Möbius sequence is a rare congenital disorder characterized by facial weakness and impaired eye movement.
• Intellectual capacities in individuals with Möbius sequence have not been extensively studied.
• An estimated 10-15% of individuals with Möbius sequence experience mental retardation.

Purpose of the Study:

• To assess the intellectual capacities of children and adolescents diagnosed with Möbius sequence.
• To evaluate the suitability of the Wechsler Intelligence Test-III (WISC-III) for assessing intelligence in this population.
• To determine the predictive value of Full Scale IQ for academic success in Möbius sequence patients.

Main Methods:

• Twenty-three children and adolescents (aged 6-16) with Möbius sequence were recruited.
• Caregivers completed questionnaires on personal, somatic, and psychosocial history.
• Intellectual functioning was assessed using the German version of the Wechsler Intelligence Test-III (WISC-III) or the Vineland Adaptive Behavior Rating Form for severe cases.

Main Results:

• Twenty-two subjects were included; 21 were assessed with the WISC-III.
• Full Scale IQ (mean: 92.05) and Performance IQ (mean: 80.48) were significantly lower than the normative sample.
• Verbal IQ (mean: 106.24) did not differ significantly, with some verbal subtests scoring higher than expected.
• Two subjects met criteria for mental retardation; Full Scale IQ did not predict academic success.

Conclusions:

• The Wechsler Intelligence Test-III (WISC-III) may not be an adequate tool for predicting academic success in individuals with Möbius sequence.
• Intelligence tests with fewer time constraints may be more appropriate for assessing cognitive abilities in this population.
• Further research is needed to understand the full spectrum of intellectual functioning in Möbius sequence.