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Lecture 6

Lecture 6 - Jan 25.doc

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McGill University
PSYC 211
Yogita Chudasama

PSYC211 Lecture 6Jan 25Neuropsychological TestingNeuropsychological tests are specifically designed tasks used to measure a psychological function known to be linked to a particular brain structure or pathwayMemoryIntelligenceLanguageVisuoperceptionExecutive functionSeveral advantages to neuropsychological assessmentsClinical diagnosisScientific investigationProvide a basis for caring and counsel for patientsProvide a means of evaluating the effectiveness of treatment and seriousness of its side effectsDisadvantagePatients with brain damage are not usually remote to one regionarea Damage could be spread outIt is very hard to find control subjects must find subjects with same comparison to actual tested patientsApproaches to Neuropsychological Testing ISingle TestTo detect presence of brain damageDiscriminate patients with psychological problems resulting from structural rather than functional changes to the brainUnsuccessful one test fails to detect the multitude of psychological symptoms that occur in a single braindamaged patientStandardizedTest BatteryTo detect presence of brain damage Involved using a set of tests Iowa gambling task lexical decision task memory assessment scales and several moreScore in each test are added together to form an aggregateIf the aggregate score falls below the designated cutoff the patient is diagnosed with brain damageUnsuccessful discriminate between neurological patients and healthy patients but not very good at discriminating between neurological patients and psychiatric patientsApproaches to Neuropsychological Testing IICustomizedTest BatteryHighly successful used routinely in hospitals for clinical diagnosis and in the laboratory for scientific investigationTo characterize the nature of the psychological deficits of each braindamaged patientStarts with a handful of selected tests to provide an indication of the general neuropsychological impairmentOn the basis of the common batter the patient is subjected to a customized series of tests to provide more detail of the specific symptomsSuccessful Measure aspects of psychological functionThe interpretation of the test does not rely on how well the patients performs on the test The focus is on the cognitive strategy the patient employs brain damage often changes that strategy without lowering the scoreThe Wechsler Adult Intelligence Scale WAISIntelligence quotient IQPoor indicator of brain damage but can be used to make inferences about general neuropsychological dysfunctionMemoryNot sensitive enough to detect memory problems per seLanguageToken test Touch the red square patient must follow instructionsDo not mix up WAIS test with IQ memory deficit can remember some general memory and language
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