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Essay/Term paper: Neuropsychologist

Essay, term paper, research paper:  Science

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A neuropsychologist is a psychologist who specializes in studying brain behavior relationships. Neuropsychologists have extensive training
in the anatomy, physiology, and pathology of the nervous system. Some neuropsychologists specialize in research while other
neuropsychologists specialize in evaluating and treating people who are thought to have something wrong with the way in which their nervous
system is functioning.

Neuropsychologists study brain behavior relationships under very specific circumstances which are both controlled and standardized. As a
general rule, this means using tests which have been validated and which have been shown to have acceptable levels of sensitivity and
specificity. This means the test can measure the thing it is trying to measure even when the thing it is trying to measure is only present in small
amounts and it also means the test can distinguish the thing it is trying to measure from other things.

If we wish to measure a thing "A" then the test has to be able to measure "A" even when very little of "A" is present; this is sensitivity.
Specificity means when we measure "A" with our test, we know that the test does not measure "B", "C," or "D."

Clinical neuropsychologists evaluate patients using one of three general methods. The first method is to use an assessment technique in which
a fixed battery of tests is given and in which we only want to know what functions are impaired and what functions are not impaired.

The most commonly used representative of this type of test is the Halstead - Reitan Neuropsychological Battery. The second method is to use
an assessment technique in which a fixed battery of tests is given but in this method there is a hierarchical each subtest so that if a function is
impaired, the level at which it is impaired can be determined. The most common representative of this type of test is the Luria - Nebraska.
Common to both of these tests is a long history of research studies examining the ability of the two batteries to measure dysfunction of the
brain and to accurately identify why that dysfunction is occurring.

The third method used by neuropsychologists is the flexible battery approach. By definition, the flexible approach is not a battery because
when one uses this approach one gives a group of tests allegedly picked for just the particular patient. This means that the particular group of
tests is not given to other patients and it is not





Neuropsychology involves the study, evaluation, and treatment of known and suspected brain disorders using the methods of psychology.





"How do neuropsychologists study these brain/behavior relationships?" Classically, brain/behavior relationships have been inferred from the
study of individuals with head injuries, tumors, neurological disease, and other unpleasant brain pathologies. Behavioral changes are assumed
to be due to this brain tissue damage. For instance, if a stroke caused damage to the very back of your brain, it is known that you will more than
likely experience visual difficulties eventhough your eyes are perfectly intact. On the other hand, if the stroke caused damage to the very front
of your brain, attention, lack of social insight, and sequencing difficulties would be expected. New brain imaging techniques have allowed us to
study brain/behavior in people without brain injury, and not surprisingly, basically the same observations have been made. In a nutshell, a
large group of the brain's functions are said to be "localized" to different areas.





The last 5 to 10 years in behavioral neurology and neuropsychology have seen tremendous advances in the understanding of the brain bases
of cognition, perception, and affect. This, in part is due to the development and growing availability of brain imaging techniques, as well as
theoretical and methodological progress in cognitive psychology.

Behavioral Neurology and Neuropsychology, Martha J. Farah, Publisher: McGraw-Hill Companies, The

Pub. Date: January 1997





Traditionally defined, neuropsychology is the study of (and, the assessment, understanding, integration, and modification of) brain-behavior
relationships. Neuropsychology seeks to understand how the brain, through structure and network functions, controls/produces behavior and
mental processes, including emotions, personality, thinking, learning and remembering, problem solving, and consciousness. It is also
concerned with how behavior may influence the brain and related physiological processes, as in the emerging field of psychoneuroimmunology
(the study that seeks to understand the complex interactions among brain and immune systems, and their

implications for health).

Neuropsychology seeks knowledge about brain and behavior relationships through the study of both normal and damaged brain systems. It
seeks to identify the underlying biological causes of behaviors, from creative genius to mental illness, that account for intellectual processes
and personality. Clinical neuropsychology seeks such understanding, particularly, in the case of how damaged biological structures alter
behaviors and interfere with their normal expressions.

If we presume that the brain is the starting point for why and how we process all mental information (not just cognitive, but interpersonal
communications, self-concept, emotional reactivity, personality, learned responses, etc.), then in some aspect, all psychology is
neuropsychology. Neurolinguistics, for example, is the study of how language shapes our self-concepts and our interpersonal
communications. Neurodevelopmental psychology is the study of how behavioral and mental characteristics change with nervous system
growth. Even psychological concepts of dreaming (and experience as a whole are subserved by brain (i.e., hard, physiological) processes.
Cognitive and even basic Skinnerian psychology, which rely on theories of how environmental stimulus and behavioral response are
connected, must account for the vital connecting link—the brain.

Neuropsychology is an objective and scientifically based formal discipline for peeking into individual minds. Clinical neuropsychology seeks,
ultimately, to understand the individual mind (and its normal as well as errant behaviors) and not just the broader, statistically normal mind. The
discipline uses experimental procedures to compare performance among persons with known differences in their biological brain structures
(within the limited criteria currently available for defining these differences), and to search for the myriad sources of variance that produce
individual differences.

In the application of clinical neuropsychology, such understanding of the biological sources of individual differences helps identify
brain-based disorders in memory, personality, self-awareness (conscious experience), cognition, and emotional expression. Working
backwards, then, from a look at abnormal behavior obtained through formal tests, reasonable inferences about brain disorders can be reached.
Understanding these neurofunctional changes (i.e., abnormalities) as a result of brain changes (i.e., injury) defines parameters for current and
future behavioral expectations in the lifestyle of the individual. As our knowledge of brain plasticity improves, such understanding also
provides realistic expectations for remediation (restoration or adjustment) of

disordered behavior.

Neuropsychological understanding is achieved through a comprehensive exploration of the neurophysiological foundation of behavior and
seemingly infinite potential contributing factors. Everyone"s brain is wired differently, a product of native biological structure, past experiences,
physical health, learned responses (and personality), injuries and diseases, and a host of other factors. Clinically, it is the role of the
neuropsychologist to sort out the factors that influence how the brain is working to form expectations in the product, progress, and recovery
from disease or injury.





Neuropsychologists use scientifically validated objective tests to measure brain functions. While CT scans, EEGs, and neurological
examinations look at structure and physical condition of the brain, the neuropsychological examination is the only way to formally assess brain
function. Neuropsychological tests cover the range from simple motor performance to complex reasoning and problem solving. In almost all
cases of objective tests, quantitative results are compared with some normative standard, including groups of non-brain injured and groups of
persons with varying kinds of brain injury. If the norms are based on age and educational achievement, good comparisons can be made
between an individual's performance and that of persons in known diagnostic categories and persons who do not have a diagnosis of brain
injury.

Qualitative assessment of neuropsychological tests provides a look at the process of the individual in producing the

quantitative scores. The combination of objective scores and behavioral process observations made by the neuropsychologist constitutes the
art and science of neuropsychological assessment.

The following listing includes some of the more frequently used neuropsychological tests and what they are intended to measure. In order to
keep test content and applications confidential to preserve their clinical usefulness, this information is restricted to general information.

Test Name

Purpose of Test

Wechsler Adult Intelligence Scale—III

This set of 13 separate "subtests" produces measures of simple memory, knowledge, problem solving, calculation, abstract thinking, spatial
orientation, and speed of mental processing. In addition to summary measures of intelligence, performance on each subtest has implications

for different neurofunctional domains. The set of tests takes about an hour or more to administer. The WAIS-III is often the foundation for a
comprehensive neuropsychological assessment.

Wechsler Memory Scale—III

This set of 18 separate "subtests" yields information about various kinds of memory and learning processes. Summary memory indices are
provided in addition to the individual scores of the subtests. The whole set of tests takes about an hour to administer. The WMS-III provides a
comprehensive assessment of memory.

Halstead Category Test

This test measures concept learning. It examines flexibility of thinking and openness to learning. It is considered a good measure of overall
brain function.

Wisconsin Card Sort Test

Similar in concept to the Category Test, this procedure also measures the ability to learn concepts. It is considered a good measure of frontal
lobe functioning.

Trail Making Tests A and B

These rather simple tests measure attention, visual searching, mental

processing speed, and the ability to mentally control simultaneous

stimulus patterns. These tests are sensitive to global brain status but are

not too sensitive to minor brain injuries.

Halstead-Reitan Battery

A set of tests that examines language, attention, motor speed, abstract

thinking, memory, and spatial reasoning is often used to produce an

overall assessment of brain function. Some neuropsychologists use some

or all of the original set of tests in this battery.

Stroop Test

This brief procedure examines attention and mental control.

Verbal Fluency (various)

There are a variety of verbal fluency tests used. Each is designed to

measure the speed and flexibility of thought processes.

Hooper Test

This procedure examines ability to visually integrate information into whole

perceptions. It is a sensitive measure of moderate to severe brain injury.

Aphasia Tests (various)

Several aphasia and language tests examine level of competency in

receptive and expressive language skills.

California Verbal Learning Test

This procedure examines several aspects of verbal learning and memory.

Shipley Scale

Comparison of vocabulary knowledge and ability to figure out abstract

sequential patterns has been established as a sensitive measure of

general brain functioning. 

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