Cognitive-behavioral disorders

Learning is a constant part of human behavior throughout life, but the quantity and quality of knowledge acquired during the first year of life is far greater—or at least comparable—to that acquired over the rest of a lifetime. The human brain increases in weight by one gram per day during the first year, followed by the formation of neuronal connections and networks that enable social smiling at one month of age, recognition of unfamiliar people at seven months, and learning to refuse to release objects around one year of age. In parallel, motor development progresses, allowing children to walk between 12 and 16 months. As development continues, cognitive (learning) and behavioral (approach–avoidance) growth intertwine, along with social interactions with parents and siblings. Many times, it is the parents—and sometimes pediatricians—who first notice that a child seems “different” or shows behaviors that draw attention.

Symptoms

The spectrum of cognitive-behavioral disorders is very broad, as are their symptoms. In general, symptoms include not achieving cognitive or behavioral milestones within the age range considered normal. For example, not exhibiting a social smile by the second month of life or not recognizing strangers by twelve months. Cognitive-behavioral disorders often form part of a broader condition, frequently with a genetic basis that may also affect other organs.

Who is affected?

The incidence of cognitive-behavioral disorders is estimated to be between 1% and 3% of all children.

Diagnosis

Parents are often the first to notice atypical signs in development or behavior, sometimes by comparing with siblings. During routine visits, the pediatrician evaluates age-appropriate developmental skills. If further assessment is needed, pediatric neurologists and geneticists can provide a more precise diagnosis. Diagnostic tests for these disorders always include a physical examination, genetic analysis, and laboratory tests that evaluate for metabolic diseases. Neuroimaging studies may also be helpful.

Common treatments

Treatment depends on the cause of the cognitive-behavioral developmental disorder. If the cause is metabolic, effective and sometimes curative treatments may exist. If the cause is genetic, it is possible to predict the course of the condition and recommend supportive educational strategies, although fully effective treatments are not yet available.

The physical examination helps determine whether the child is reaching developmental milestones appropriate for their age.

Genetic tests detect whether there is an alteration in the patient’s genes that could explain the observed anomaly.

Laboratory tests—typically using blood or urine—help confirm or rule out abnormalities in the body’s normal metabolic pathways.

Most common tests

Pediatric neurological examination, imaging studies, metabolic laboratory tests, genetic studies based on sequencing or ultra-sequencing, and evaluation by Child Psychiatry (Pediatric Psychiatry).

Prevention

If there is a family history of cognitive-behavioral disorders, genetic counseling prior to pregnancy may be useful. The neurosensory development of children is a complex process that begins during intrauterine life and continues from the neonatal stage through childhood and adolescence. Adequate monitoring during pregnancy and childbirth is also essential to help prevent these types of disorders.