**Core Concept**
Infantile autism, also known as Autism Spectrum Disorder (ASD), is a neurodevelopmental disorder characterized by impaired social interaction, communication, and repetitive behavior patterns. The exact cause of ASD remains unknown, but it is believed to involve a complex interplay of genetic, environmental, and neurobiological factors.

**Why the Correct Answer is Right**
Infantile autism is often associated with abnormalities in brain structure and function, particularly in regions involved in social cognition and communication. For example, studies have shown that individuals with ASD tend to have reduced activity in the mirror neuron system, a network of brain regions responsible for simulating and understanding the actions of others. This impairment in social cognition is thought to contribute to the characteristic social interaction difficulties seen in ASD.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because infantile autism is not primarily characterized by intellectual disability. While many individuals with ASD do have intellectual disabilities, not all individuals with ASD have significant cognitive impairments.

**Option B:** This option is incorrect because infantile autism is not primarily characterized by a loss of language skills. In fact, many individuals with ASD have preserved or even enhanced language abilities, although their social communication skills may be impaired.

**Option C:** This option is incorrect because infantile autism is not primarily characterized by a specific type of seizure disorder. While some individuals with ASD may experience seizures, the two conditions are distinct and not directly related.

**Clinical Pearl / High-Yield Fact**
A key clinical feature of infantile autism is delayed or absent language development, often accompanied by a lack of social interaction and repetitive behavior patterns. This constellation of symptoms can be remembered using the mnemonic "SOCRATES": Social interaction difficulties, Odd behaviors, Communication impairments, Repetitive behaviors, Abnormalities in speech, Tics, and Emotional regulation difficulties.

**Correct Answer:** B.