The diagnosis “Disturbance of brain performance" changes life. Mostly it hits the person concerned and his family „suddenly and in the middle of life". There are various causes: Stroke, TBI (e.g., after an accident or a tumor), diseases like multiple sclerosis or dementia, but also psychic diseases or behavioral conspicuities in the childhood. Often memory, concentration abilities, reactivity, spatial orientation, language and/or seeing are affected.

A disturbance of the attention mostly means that the frontal lobe of the brain is damaged. People with attention disturbances often complain about memory problems and tiredness, but also about the fact that they can be easily distracted. Often those people are accused to let themselves go and to show little effort. In everyday life a disturbance of the attention appears in the fact that it is not possible for the person concerned e.g. to read a bus timetable or to follow a conversation.

For a person with a memory disturbance the process during the memory performance does not work: First the information must be percepted, then it is processed and stored in the end. And when the information will be needed later, it is triggered again.

Disturbances of the executive functions are mostly settled in the frontal lobe of the brain. Such damage mostly concerns the motor, social, emotional, linguistic and cognitive abilities. People with disturbances of the executive functions often show little interest in their own environment and are not aware of their disease. They have problems planning an action and often forget what they are supposed to do in the middle of the task. They also often have difficulties to show flexibility and are in favor of neglecting communication and nutrition.

People with visual field disturbances usually have absolutely healthy eyes. The disturbance lies on both visual paths which work as the connection between the eyes and the brain. Because those nerves are very long and stretch almost through the whole brain, the chance is very high that with a damage of the brain also the visual field is concerned. That can affect only a small part of the visual field, but also a complete side or more. With such damage it is impossible for most persons concerned to read a book or a text in general.

The coordination of visual perception with the musculoskeletal system is called "Visual motor ability". For example, the eye-hand coordination is difficult for persons with disturbances of the visual motor ability, since it is part of the sensory motor functions. Visual motor ability characterizes the quality of ingesting and processing visual symbols as well as the ability of their hand-motor realization. The intact visual perception ability and adequate eye-hand coordination are the base.  

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