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PSYB32 Lec 4 Oct 2 2012.docx

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Konstantine Zakzanis

PSYB32 – Lecture 4 – October 2 2012  Midterm next Tuesday. – MCQ – read chapters, go over important sections mentioned in class  Reliability – consistency of measurement  Test-Retest reliability – some constructs don’t change (e.g.) so they have HIGH Test-Retest Reliability  Alternate form reliability – Giving different versions of the test –eliminating practice effects  Internal consistency reliability – ensuring all items in test are asking the same thing – test this by splitting the number of questions in half and comparing them.  Validity – if a test is not reliable, it is not valid. Reliability is a necessary component  Content Validity – need to measure as much of the construct as possible. The questions in a survey need to ask enough questions to get a full scope of what is trying to be understood. The test should measure ALL kinds of symptoms (if testing for a disorder).  Criterion Validity – Test needs to measure what we say it measures.  Convergent Validity – Results on 2 different tests for the same disorder, for example, should come to the same conclusion (should converge)  Predictive Validity – the test needs to be predictive of what it is measuring.  Construct Validity – In order to test this, we compared the results of patients with and without the disorder. The difference in results measures the construct validity. Psych Assessment :-  Questions in a psych assessment are defined by many variables.  Depends on paradigm followed – this will dictate the questions  Structured Interview – Questions given in a planned order (e.g SKID)  Semi-Structured – Questions not as systematically followed ( a bit more free form) Behavioural Observations:-  Facial Expressions  Lying, nervousness, withdrawal  Can be almost diagnostic. Limitations of Clinical Interviews:-  Honesty by patient/subject is not a guarantee  Negative impression management -> feigning or exaggerating symptoms or feelings  Sometimes the person may have no insight on how they are feeling  Positive Impression Management – Not willing to admit minor faults/symptoms. Psychological Tests:-  Screening Measures – Checklists of symptoms a patient may or may not have.  Beck Scales – -Have limitations -Situation/Context of interpretation is important -How do you prove someone is exaggerating? -Test
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