Brain Fitness: the overall state of sharpness, clarity, attention and sensitivity-  mainly as the result of sufficient cognitive exercise and proper nutrition.

Brain Fitness Program: calculated array of cognitive exercises, engineered to stimulate certain areas in the brain in targeted ways.

Chronic Stress: Long-term mental stress. Prolonged neurological arousal where stress factors block the regeneration of neurons, as well as causing immune deficiencies.

Cognitive training various mental exercises targeted to improve core cognitive abilities such as attention, memory, retrieval time problem-solving skills and etc.

Mental Reserve: (theory) It has been speculated that individuals differentiate considerably in the severity of mental aging and dementia. Cognitive stimulation, constant learning and occupational level are now considered to be substantial factors helping to construct a "cognitive reserve" that may resist the attacks of neurological disease.

fMRI: functional magnetic resonance imaging  is a non-invasive brain imaging technology  that enables experts to view images of changing blood flow in the CNS associated with neural arousal. The images reveal which structures are stimulated during performance of different mental tasks.

Neuroimaging: techniques that image the structure, function, or pharmacology of the brain. Most recent techniques include fMRI, PET, EEG and more.

Neuro-plasticity: the brain's ability to reconstruct itself by forming different synaptic connections throughout life: The brain "reacts" to the outside environment physically.

Working memory: the ability to "hold" information current for a short period of time while using it. Working memory is applied whenever we are in control of our attention. Low capacity of working memory can lead to attention problems.