Disinhibition of Primitive Reflexes in Attention Deficit and Hyperactivity Disorder: Insight Into Specific Mechanisms in Girls and Boys.

Objective: Cognitive and motor disintegration and other functional disturbances in various neuropsychiatric disorders may be related to inhibitory deficits that may manifest as a persistence or re-expression of primitive reflexes and few recent data suggest that these deficits may occur in Attention Deficit and Hyperactivity Disorder (ADHD). Methods: We have tested a hypothesis to which extent ADHD symptoms and balance deficits are related to persisting primitive reflexes, such as Asymmetric Tonic Neck Reflex (ATNR) and Symmetric Tonic Neck Reflex (STNR) in 80 medication-naïve children with ADHD (40 boys and 40 girls) in the school age (8-11 years) and compared these data with a control group of 60 children (30 boys and 30 girls). Results: These data show new finding that ADHD symptoms and balance deficits are strongly and specifically associated with persistent ATNR in girls and STNR in boys. Conclusions: These results provide first evidence in medical literature that ADHD in girls and boys is specifically related to distinguished neurological developmental mechanisms related to disinhibition of primitive reflexes.

Balance deficits and ADHD symptoms in medication-naïve school-aged boys.

BACKGROUND AND OBJECTIVES: Functional disturbances developed early in life include balance deficits which are linked to dysfunctions of higher levels of cognitive and motor integration. According to our knowledge, there are only a few studies suggesting that balance deficits are related to behavioral disturbances in attention-deficit/hyperactivity disorder (ADHD). METHODS: We tested the extent to which balance deficits were related to ADHD symptoms in 35 medication-naïve boys of school age (8-11 years) and compared the results with a control group of 30 boys of the same age. RESULTS: ADHD symptoms in medication-naïve boys had specific relationships to disturbances of postural and gait balance. CONCLUSION: To our knowledge, this study provides the first evidence in the medical literature for a direct relationship between ADHD symptoms and balance deficits, that cannot be attributed to medication and the presence of any neurological disease.

Persisting primitive reflexes in medication-naïve girls with attention-deficit and hyperactivity disorder.

BACKGROUND AND OBJECTIVES: Recent and historical findings suggest that later-developed functions during brain ontogenesis related to higher levels of cognitive and motor integration tend to replace the older, more primitive, ones, and the persistence of the older functions may be linked to specific neuropsychiatric disorders. Currently, there is growing evidence to suggest that persisting primitive reflexes may be related to developmental and neurodegenerative disorders. Preliminary data also suggest that persisting primitive reflexes may be specifically linked to attention-deficit and hyperactivity disorder (ADHD). METHODS: In the study reported here, we tested to what extent the persisting primitive asymmetric tonic neck reflex and symmetric tonic neck reflex are related to ADHD symptoms measured by Conners' Parent Questionnaire in 35 medication-naïve girls of school age (8-11 years) with ADHD. The results were compared with those of a control group of 30 girls of the same age. RESULTS: This study showed that persisting primitive reflexes are closely linked to ADHD symptoms. CONCLUSION: The data suggest that ADHD symptoms may be linked to more primitive neural mechanisms interfering with higher brain functions due to insufficiently developed cognitive and motor integration.

Asymmetric tonic neck reflex and symptoms of attention deficit and hyperactivity disorder in children.

One of the particularly important postnatal developmental reflexes that diminish in later stages of development is asymmetric tonic neck reflex (ATNR), which belongs among the so-called primitive reflexes. According to current evidence, certain later developed functions during ontogenesis of the central nervous system tend to replace the primitive reflexes, and their persistence is related to certain specific neuropsychiatric or neurological disorders. According to current knowledge, there is no evidence to which extent persistence of these reflexes may play a role in attention deficit and hyperactivity disorder (ADHD). With respect to these findings, we have tested a hypothesis to which extent persisting primitive reflex ATNR in 60 children in the school age (8-11 years) will be related to symptoms of ADHD and compared the results with 30 children of the same age. Results of this study show that ADHD symptoms are closely linked to persisting ATNR, which indicates that ADHD symptoms may present a compensation of unfinished developmental stages related to diminishing ATNR.