Cognitive functioning is your ability to gain knowledge, use language, solve problems and plan. It includes functions such as memory, attention, perception, reasoning and decision-making. Neuropsychology studies the relationship between the brain, behaviour and mind. Cognitive neuropsychology specifically studies the association of the different parts of the brain with different cognitive functions. The brain may undergo changes with age, disease and injury, which can affect cognitive functioning and behaviour in different ways. Neuropsychology studies the effect of these changes and finds its use in the assessment, treatment and rehabilitation of those with neurological conditions such as dementia, brain injuries, and memory and learning disorders.