The Neurodevelopmental Science Behind Autism

Development Begins With Movement

Development begins with motor organization. Infant reflexes and early movement patterns help the brain establish coordination between the body, the sensory systems, and spatial awareness.

Motor development typically progresses through:

• Reflex patterns
• Gross motor coordination
• Fine motor control
• Ocular motor coordination

Because eye movements are part of the body's motor system, stable visual attention depends on the successful organization of earlier motor systems.

When early motor development is interrupted, ocular motor coordination may still be organizing.

These nerves coordinate the muscles that allow both eyes to align with the same visual target.

When both eyes align successfully, the brain merges the two images into a single perception. This process is called binocular fusion. Binocular vision allows the brain to construct a stable spatial representation of the world.

When binocular coordination is unstable, central fixation may require significant neurological effort. From the ICONIX perspective, this may lead to central field neglect, which is often observed in autism.

Retinal Ganglion Cells and Visual Information

Visual information enters the brain through specialized retinal neurons called ganglion cells. These cells transmit signals through two major pathways:

Dorsal and Ventral Visual Streams

After visual signals leave the retina, they travel to the occipital cortex at the back of the brain. From there, visual information divides into two major processing pathways.

Visual information enters through the retina, travels to the occipital cortex, and divides into two pathways. The dorsal stream processes motion and spatial information, while the ventral stream processes object recognition and symbolic understanding.

Attentional Distribution in Autism

When binocular coordination is difficult, the nervous system may rely more heavily on motion signals from the magnocellular pathway.

This strengthens dorsal-stream processing while reducing reliance on ventral-stream symbolic processing.

This difference in attentional distribution may influence:

• Sensory preferences
• Visual attention
• Imagery formation
• Language development

Imagery and Language

When visual information travels successfully through the ventral stream, the brain can form stable internal representations of objects and faces.

These representations support visual imagery within the mind. Imagery allows the mind to recall and manipulate visual information even when the object is not present.

Because the ventral stream connects closely to language networks in the temporal cortex, reduced ventral-stream processing may influence symbolic processing and speech development.