Levels of Theories
Single factor explanation, Interactionist explanations
Single Factor Explanation
Attempts to trace the origins of a particular disorder to one factor (ex. single factor explanation of social anxiety may bet hat it runs in families)
Interactionist Explanations
View behaviour as the product of the interaction of a variety of factors, generally make more satisfactory theories is describing mental disorders
Three Essential Features of a Scientific Study
(1) They integrate most of what is currently known about the ohenomena in the simples way possible; (2) They make testable predictions about aspects of the oneomena that were not previously thought of; (3) They make it possible to specify what evidence would deny the theory
Null Hypothesis
Essentially proposes that the prediction made from the theory is false
Psychological Assesment
A systematic gathering and evaluation of information pertaining to an individual with suspected abnormal behaviour
Test Retest Reliability
Refers to the degree to which a test yields the same results when it is given more than once to the same person
Internal consistency
Refers to the degree of reliability within a test (ti what extent do different parts of the same test yield the same results)
Split Half Reliability
Evaluated by comparing responses on odd numbered test items with responses on even numbered test items. If the scores for the responses are highly correlated, than the test has high split half reliability
Coefficient Alpha
Calculated by averaging the intercorrelations of all items on a given test. The higher the coefficient alpha, the higher the internal consistency
Face Validity
Whether a test appears to measure what it’s supposed to measure
Content validity
Test must include a representative sample of all behaviours related to the construct
Criterion Validity
A way to check if a test or measurement tool accurately predicts or relates to some specific outcome or criteria (eg. Testing whether a yardstick measures the length of an object correctly by comparing it to a known standard length)
Construct Validity
Ensuring that a test measures the abstract concept or trait it claims to measure, like checking that a thermometer actually measures temperature accurately rather than something else like weigh tor height
Clinical Approach
Guided by intuition because they value clinicians experience and personal judgement is used the most (They prefer to draw on al available data in their own manner; they are guided by intuition honed with professional experience rather than formal rules)
Actuarial Approach
The human judge is eliminated and conclusions rest solely on empirically established relations between data and the condition or event of interest (This method is more efficient in making predictions in a variety of situations)
Types of Assessments
Biological Assessments; Psychological Assessments; Behavioural and Cognitive Assessments
Biological Assesments
Brain Imaging; Computer Tomography; Magnetic Resonance Imaging (MRI), FMRI;Positron Emisson TOmography (PET); Neuropsychological Assesments
Brain Imaging Techniques
EEG uses electrodes placed on parts of the scalp to measure brain’s electrical activity (sometimes patients may have to carry out visual or auditory tasks to see how brain responds). Deviations in a particualr part of the brain may be an indication of a problem (seizure disorder, brain lesions and tumors through EEG examination)
Computer Tomography (CT)
Two dimensional image/cross section of the brain. Used to look at changes in structural abnormalities before and after treatment. Is static, clinicians use to determine cause of structural abnormalities such as reduced blood flow
Magnetic Resonance Imaging (MRI)
Non invasive technique that reveals both the structure and the functioning of the brain. Produces detailed images of almost every internal structure in the body including the organs, bones, muscles, and blood vessels. Clinicians use to determine the cause of structural abnormalities such as reduced blood flow
FMRI
Measures the small changes in blood flow that occur with brain activity
Positron Emission Tomography (PET)
Combination of computerized tomography and radioisotope imaging. Allows scienteists to measure a variety of biological activities as the processes occur in the living bain (clinicians use to determine cause of structural abnormalities such as blood flow)
Neuropsychological Assessments
Used to determine relations between behaviour and brain function