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Delayed maturation of the frontal cortex in childhood autism
M Zilbovicius1, B Garreau, Y Samson
1Service Hospitalier Frédéric Joliot, Tours, France.
Insights
Autistic children show delayed frontal cortex maturation, evidenced by reduced blood flow in early childhood. This pattern normalizes by age 6-7, suggesting a temporary delay in brain development for autism.
Area of Science:
- Neuroscience
- Developmental Psychology
- Pediatrics
Background:
- Childhood autism is a complex neurodevelopmental disorder.
- Understanding brain maturation patterns is crucial for early diagnosis and intervention.
- Frontal cortex development plays a key role in cognitive and social functions.
Purpose of the Study:
- To investigate the metabolic maturation of the frontal cortex in preschool-aged children with autism.
- To compare frontal lobe blood flow patterns in autistic children versus typically developing children.
Main Methods:
- Longitudinal study of regional cerebral blood flow (CBF) using single photon emission computed tomography (SPECT).
- Five children diagnosed with autism (DSM-III-R) were assessed at ages 3-4 and 6-7 years.
- Comparison group of five age-matched, typically developing children.
Main Results:
- Autistic children exhibited transient frontal hypoperfusion at ages 3-4 years.
- This hypoperfusion pattern mirrored that of much younger, non-autistic children.
- By ages 6-7 years, frontal perfusion in autistic children reached normal levels.
Conclusions:
- CBF patterns reflect maturational changes in brain function.
- Delayed frontal maturation is indicated in childhood autism.
- This maturational delay aligns with clinical and cognitive profiles of autistic children.
Objective:
The authors investigated the metabolic maturation of the frontal cortex in pre-school autistic children.
Method:
Regional cerebral blood flow (CBF) in five children with primary autism diagnosed according to the DSM-III-R criteria was studied longitudinally. Regional CBF in each of the autistic children was measured with single photon emission computed tomography twice during their development: at the age of 3-4 years and 3 years later. At each stage, the autistic children were compared to an age-matched comparison group of five nonautistic children with normal development.
Results:
A transient frontal hypoperfusion was found in the autistic children at ages 3-4 years; this corresponded to the pattern of perfusion observed in much younger normal children. By the ages of 6-7, the autistic children's frontal perfusion had attained normal values.
Conclusions:
Since CBF patterns in children are related to maturational changes in brain function, these results indicate a delayed frontal maturation in childhood autism. Such a delayed brain maturational process is consistent with the clinical data and cognitive performance of autistic children.