The Brain that Changes Itself summary

Introduction

The Brain That Changes Itself by Norman Doidge The brain remains changeable throughout life, reshaping itself through experience, attention, repetition, imagination, injury, and recovery. For much of modern neuroscience, the adult brain was considered largely fixed after development. Age could weaken it, and injury could damage it, but its basic organization supposedly remained stable. Norman Doidge presents a radically different picture.

Neuroplasticity shows that neural pathways can strengthen, weaken, compete, and reorganize throughout life. These changes can support recovery and learning. They can also reinforce habits and patterns we would rather escape. The important question is not simply whether the brain changes.

It is what repeatedly directs that change. Experience, attention, practice, and imagination all help determine which pathways gain strength. That discovery changes how we understand learning, rehabilitation, psychological treatment, and human potential.

discovering the plastic brain

Discovering the Plastic Brain. The traditional brain model assigned major functions to pathways that supposedly became permanent after development. Once those pathways matured, researchers expected little fundamental reorganization. Neuroplasticity challenged that assumption.

The brain can change both its structure and function throughout life. Neuro refers to neurons, the nerve cells forming the brain and nervous system. Plastic describes their capacity to reorganize through experience, thought, and activity. One mechanism behind this adaptability is unmasking.

When a major pathway stops functioning, a weaker route can become available and strengthen through repeated use. Cheryl Schiltz experienced this process after losing almost all normal vestibular function. Standing made her feel as though she might fall because her damaged balance system provided unreliable information. Neuroplasticity pioneer Paul Bach-y-Rita developed a device that delivered balance information through her tongue.

An accelerometer translated movement into signals sent through electrodes resting on a plastic strip. Her brain gradually learned to use those signals as an alternative source of balance information. Repeated practice strengthened pathways capable of processing the substitute input. Eventually, Schiltz began maintaining balance even after the device was removed.

Her recovery revealed an important principle. Restoring a function does not always require restoring its original neural pathway. Sometimes another pathway can carry the necessary information. The brain is therefore not merely an organ we inherit.

It is also shaped by what we repeatedly require it to do.