NCT key terms

A structured evaluation of cognitive, emotional, and behavioral functioning using standardized tests and clinical observation, used to identify deficits, characterize strengths, and guide diagnosis and rehabilitation planning after neurological injury or disease.

Delivering a test exactly as its manual specifies, including scripted instructions, timing, materials, and scoring rules, so that scores can be compared with normative data and results remain reliable across examiners and settings.

A score interpreted by comparing an individual's performance with the distribution of scores from a defined reference group, often expressed as a percentile, standard score, or T-score rather than a raw count of correct responses.

A planned set of tests selected to sample multiple cognitive domains, such as memory, attention, language, and executive function, chosen to answer referral questions while balancing breadth, administration time, and patient fatigue.

An assessment approach in which every patient receives the same comprehensive set of tests regardless of referral question, supporting comparability across patients and reducing examiner selection bias, but often requiring long administration time.

An assessment approach in which the examiner selects tests based on the referral question, initial findings, and patient characteristics, allowing targeted hypothesis testing but reducing direct comparability across patients and increasing reliance on examiner judgment.

The frequency with which a particular score, sign, or finding occurs in a reference population, used to judge whether an isolated low score is unusual or merely common among healthy individuals completing many measures.

Distortions that occur when a test is too easy, so many examinees score at the maximum, or too hard, so many score at the minimum, compressing variance and limiting sensitivity to change or individual differences.

Improvement in test performance caused by prior exposure to the same or similar items rather than by genuine change in ability, which complicates repeated testing and requires alternate forms or reliable change estimates.

A statistic that expresses whether the difference between two scores exceeds the amount expected from measurement error alone, helping examiners decide whether a change over time is meaningful rather than random fluctuation.

An estimate of the average variability of observed scores around a person's true score due to imperfect reliability, used to build confidence intervals around a single test result and to judge score differences.

The degree to which different examiners assign the same scores to the same behavior or response, reflecting how consistently scoring criteria are defined and applied across raters and occasions.

The extent to which test performance predicts real-world functioning, such as managing finances, driving, or returning to work, which may be limited even when a laboratory measure is psychometrically sound.

An assessment task requiring the examinee to actually carry out an activity, such as assembling objects or simulating daily tasks, rather than to report on abilities, capturing functional capacity under observed conditions.

A questionnaire or interview in which the person describes their own symptoms, mood, or functioning, efficient for capturing subjective experience but vulnerable to limited insight, exaggeration, or response bias.

Use of embedded or stand-alone measures designed to detect feigning, exaggeration, or inconsistent effort, helping the examiner judge whether obtained scores accurately reflect the person's actual cognitive abilities.

The intentional production or exaggeration of symptoms for an external incentive, such as financial compensation, avoidance of work, or reduced legal responsibility, distinguished from factitious disorder by the presence of identifiable gain.

Assessment of whether the examinee is applying adequate and consistent cognitive effort during evaluation, often using forced-choice tasks with very easy items that most genuine patients perform accurately.

The process of explaining the purpose, procedures, risks, confidentiality limits, and alternatives of an evaluation before it begins, then documenting that the person voluntarily agrees to participate.

The ethical and legal obligation to protect information disclosed during assessment from unauthorized release, subject to defined exceptions such as imminent danger, court order, or mandated reporting.

The obligation to protect test materials, items, and scoring keys from disclosure or misuse so that the instrument retains validity and future examinees are not exposed to content in advance.

Legal protection giving the creator of a test, manual, or scoring program exclusive rights to reproduce and distribute the work, so examiners may not copy protected materials without permission from the publisher or rights holder.

A limited legal doctrine permitting use of copyrighted material without permission for purposes such as criticism, teaching, or research, evaluated by factors including purpose, amount used, and effect on the market.

The ethical requirement that a professional practice only within the boundaries of their training, supervised experience, and credentials, referring clients to qualified colleagues when a question exceeds their expertise.

The legally and professionally defined range of activities a credentialed provider may perform, such as administering and interpreting psychological tests, which varies by jurisdiction and license type.

Oversight of a trainee's or less experienced clinician's assessment work by a qualified professional who reviews cases, scores, and reports, ensuring quality and ethical conduct while developing the supervisee's competence.

Situations in which a professional holds another role with a client, such as friend, employer, or relative, which can impair objectivity and exploit power differences and are avoided when feasible.

The awareness, knowledge, and skills needed to assess people from diverse backgrounds, including recognizing how language, acculturation, education, and test norms may bias interpretation of performance.

A systematic error in which a test measures or predicts differently for members of one group than another for reasons unrelated to the construct, such as item content, language demands, or inappropriate norms.

The process of adopting the language, values, and customs of a new culture, which influences test performance and should be considered when selecting norms and interpreting scores for immigrant examinees.

The degree to which an examinee understands and uses the language of a test, a critical variable because testing in a weaker language can depress scores and confound cognitive impairment with limited fluency.

The capacity to focus on relevant information, sustain concentration over time, and shift or divide focus as demands change, underlying nearly all other cognitive performance and frequently affected by neurological insult.

A limited-capacity system for temporarily holding and manipulating information during ongoing tasks, such as remembering a list while performing mental arithmetic, and sensitive to frontal and parietal damage.

The rate at which a person can perform simple cognitive operations, often measured by timed coding or symbol-matching tasks, and commonly slowed in aging, depression, and white matter disease.

Higher-order abilities including planning, inhibition, cognitive flexibility, and problem solving that govern goal-directed behavior, typically linked to frontal lobe systems and assessed with tasks requiring rule use and mental set shifting.

Memory for personally experienced events tied to a specific time and place, tested by recall or recognition of word lists and stories, with encoding, consolidation, and retrieval stages that can be affected independently.

Store of general knowledge about facts, concepts, and word meanings that is not tied to a particular learning episode, distinguished from episodic memory by its impersonal and context-free content.

Two memory retrieval formats in which recall requires generating information from memory while recognition requires identifying previously presented material, with recognition generally easier and less affected by retrieval deficits.

The initial process of transforming sensory information into a memory representation, influenced by attention and strategy, and often the stage most impaired in amnestic conditions and normal aging.

The system of symbols and rules used to communicate, assessed through naming, fluency, comprehension, and repetition tasks, with distinct syndromes such as aphasia reflecting damage to specific cortical networks.

An acquired language disorder caused by brain damage, typically to the dominant hemisphere, affecting production, comprehension, repetition, or naming to varying degrees depending on lesion location and extent.

A disorder of skilled movement in which a person cannot perform a learned gesture on command despite intact strength, sensation, and comprehension, reflecting disruption of motor planning rather than paralysis.

The capacity to perceive, manipulate, and mentally represent spatial relationships, assessed with tasks such as block design, clock drawing, and line bisection, and vulnerable to right hemisphere damage.

A failure to attend to or respond to stimuli on one side of space, most often after right parietal damage, which can distort test performance and daily functioning in ways not explained by sensory loss.

The process of distinguishing among conditions that could produce similar findings, such as depression versus dementia or delirium versus chronic cognitive decline, by integrating history, test patterns, and clinical course.

An acute, fluctuating disturbance of attention and awareness often caused by medical illness, medication, or withdrawal, requiring urgent identification because it is treatable and easily mistaken for dementia.

A progressive decline in multiple cognitive domains severe enough to interfere with independence, arising from neurodegenerative or vascular disease, distinguished from delirium by its chronic and stable course.

Cognitive decline greater than expected for age but not severe enough to disrupt everyday independence, often representing a transitional state with elevated risk of progression to dementia.

Subjective cognitive complaints with objective performance inconsistent with genuine neurological disease, arising from psychological or behavioral factors rather than neurodegeneration, and requiring careful positive diagnosis.

The process of translating assessment data into a clear, organized document that answers the referral question, integrates history and test findings, states diagnoses and limitations, and offers actionable recommendations.

A meeting in which the examiner explains results, diagnoses, and recommendations to the client or family in understandable language, checks comprehension, and addresses questions while maintaining confidentiality boundaries.

The specific reason a patient was sent for evaluation, such as clarifying diagnosis or determining capacity, which guides test selection, interpretation priorities, and the structure of the final report.