Many young people who have an acquired brain injury (ABI) may appear to make a relatively good physical recovery. Injury to the parts of the brain that regulate movement, posture and co-ordination result in gross and/or fine motor difficulties. Abnormalities of muscle tone may occur after ABI. A brain injury can disrupt any part of the sensory system that transmits or processes sensory information – sight, hearing, smell, taste or touch. Seizures occur when the normal functioning of the brain is disrupted by neurons firing electrical impulses in an excessive or disorderly way. There are many areas of our brains that have developed in order to enable us to process, to formulate and to functionally use language as communication in speech and writing. Memory can also be described in relation to the sensory modality with which it is initially encoded or 'registered'.