Forensic neuropsychologists primarily assess cognitive abilities, such as memory, attention, and decision-making, as well as psychological functioning, including personality traits and emotional regulation, to understand an individual's mental state and behavior.

The M'Naghten Rule, established in 1843, is a legal principle that determines criminal responsibility based on an individual's mental state at the time of the offense. It states that a person is not criminally responsible if, due to a mental disorder, they did not understand the nature and quality of their actions or could not distinguish between right and wrong.

Forensic neuropsychologists serve as expert witnesses in criminal trials, providing testimony on the defendant's mental state, cognitive abilities, and psychological functioning. Their expertise helps the court understand the defendant's capacity to understand the charges against them, form intent, and control their behavior.

Diminished Capacity is a legal defense that acknowledges that a mental disorder may have impaired an individual's ability to control their behavior, leading to a crime. It does not negate criminal responsibility entirely, but it may result in a reduced sentence or alternative sentencing options.

Magnetic Resonance Imaging (MRI) is a widely used brain imaging technique in forensic neuropsychology. It provides detailed anatomical images of the brain, allowing experts to examine brain structures, detect abnormalities, and assess the impact of brain injuries or disorders on an individual's behavior and mental functioning.

A Competency Hearing is a legal proceeding to determine whether an individual is mentally competent to stand trial. It assesses their ability to understand the charges against them, assist their attorney in their defense, and participate meaningfully in the legal process.

The Trail Making Test is a neuropsychological test that assesses an individual's executive functioning skills, including attention, processing speed, and cognitive flexibility. It involves connecting numbers and letters in a specific sequence, alternating between numerical and alphabetical order.

Frontal Lobe Syndrome is a condition resulting from damage to the frontal lobes of the brain. It can lead to changes in personality, behavior, and cognitive abilities, such as impaired judgment, impulsivity, and difficulty with social interactions.

Civil Commitment Laws allow individuals to be involuntarily committed to a mental health facility for treatment if they pose a danger to themselves or others due to a mental disorder. These laws vary across jurisdictions and typically involve a legal process to determine the necessity of involuntary commitment.

Risk Assessment is a process used in forensic neuropsychology to evaluate an individual's likelihood of engaging in future criminal behavior. It considers various factors, including psychological, social, and biological variables, to inform decisions about sentencing, treatment, and release from custody.

The Wechsler Memory Scale (WMS) is a neuropsychological test that assesses an individual's memory and learning abilities. It includes various subtests that measure different aspects of memory, such as immediate and delayed recall, verbal and visual memory, and working memory.

The Insanity Defense is a legal defense that asserts that an individual should not be held criminally responsible for their actions due to a mental disorder that impaired their ability to understand the nature and quality of their conduct or to distinguish between right and wrong.

Electroencephalography (EEG) is a brain imaging technique that measures electrical activity in the brain. It is commonly used in forensic neuropsychology to assess brain activity during cognitive tasks, such as attention, memory, and decision-making, providing insights into an individual's cognitive functioning.

A Competency Hearing is a legal proceeding to determine whether an individual is mentally competent to stand trial. It assesses their ability to understand the charges against them, assist their attorney in their defense, and participate meaningfully in the legal process.

The Stroop Color and Word Test is a neuropsychological test that assesses an individual's attention and processing speed. It involves reading words printed in different colors while naming the color of the ink, requiring the individual to inhibit the automatic response of reading the word and focus on the color.