Part of adequate preparation for an assessment that will involve recording or the presence of third-parties is reviewing the relevant research and professional guidelines.
We hope that this review helps to highlight some of the key methodological and conceptual challenges that remain, as well as providing useful suggestions for subsequent studies. You complete the testing. In addition, one can use behavioral performance as a covariate in analyses of the imaging data in order to elucidate the degree to which changes over time in functional brain activity relate to changes in behavioral performance.
One important question for multi-site studies is whether calibration across sites is only necessary for an initial study, or whether such calibration would need to be conducted anew for each new study, should the same set of sites conduct multiple studies.
Quality assurance considerations Some aspects of quality assurance for imaging biomarkers are relatively obvious, such Pitfalls associated with psychometric measures in ensuring that the correct acquisition parameters and procedures are used for all protocols.
Here we discuss behavioral performance and multi-site issues. This is of particular concern if practice effects are confounded with events within the clinical trial, such that the first testing session is always off drug and the second is on drug or post intervention.
Caceres and colleagues recently completed a study that compared four different approaches to assessing ROI level reliability in an fMRI study. In the context of our DPX example, internal consistency reliability would refer to the degree to which the different instances of high and low goal maintenance trials provide similar values of Blood Oxygen Level Dependent BOLD activity across subjects.
Thus, excluding those individuals performing poorly at the start of the trial could eliminate precisely those individuals who are most likely to benefit from the intervention. To help protect ourselves against confirmation bias in which we give preference to information that confirms our expectationsit is useful to search actively for data that disconfirm our expectations, and to try out alternate interpretations of the available data.
Of course, including a no-intervention control group and using parallel task versions when available helps address this concern.
In such cases, a relative ICC estimate is appropriate n the context of classical test theory, reliability is a unitary construct that does not explicitly distinguish among different sources of measurement error. Newspapers can be especially useful to develop a grasp of local language nuances.
He works full time as an auto mechanic and has insurance that covers the testing procedures. Multi-site Considerations Ideally, one would use identical equipment for task presentation and data acquisition across sites, although the degree to which differences in such factors influence the imaging data may depend on the nature of the task paradigm.
The results of these comparisons suggested that the ICCv was strongly influenced by smoothing in the data and that ICCmax had the lowest ICC values and was strongly influenced by smoothing and cluster size see 9 for more detail.
Aiming to perform well in all three is more likely to land you the job than focusing on just one aspect of the hiring process. We think that the discussion of various psychometric and quality assurance considerations will make more sense if couched in the context of a specific concrete example.
Reliability coefficients based on internal consistency, such as coefficient alpha 8estimate measurement error based on variation across the instances of measurement, or items, for measures that employ multiple items.
The above discussion focuses on evaluating the reliability of activation in individual ROIs or single voxels on the one hand. Analysis Approach and Power In studies using measures of functional brain activity, the choice of analysis approach can have a major impact on power.
Psychometric testing works best when it is combined with interviews, role-playing exercises and reference checks.
An analysis of this type of generalizability study design would focus on a dependent measure of interest, such as activity associated with high goal maintenance trials, either in specific brain regions or on a voxel-by-voxel basis.
This is because it is impossible for a measure to correlate more highly with a validity criterion e. Further such fMRI or ERP measures can also serve in a second role for biomarkers, namely as surrogate outcome measures that may allow early evaluation of the eventual efficacy of a drug on longer term outcomes 1.
See supplemental materials for a discussion of additional approaches to assessing reliability that treats voxels rather than subjects as the objects of measurement.
Please see the supplemental materials for a more detailed discussion. The supplemental data section contains a formal definition of reliability using classical test theory CTT. Our example will be the use of fMRI to measure brain function associated with one of the constructs and tasks identified as relevant for translation in the first phase of the CNTRICs initiative: Iannetti and Wise have provided a cogent and comprehensive review of these issues A second concern associated with behavioral performance is that changes in performance across the course of a trial may confound interpretations of changes in brain activity 27 - For example, the person may have forgotten the glasses they need for reading, be suffering from a severe headache or illness, be using a hearing aid that is not functioning well, be taking medication that impairs cognition or perception, have forgotten to take needed psychotropic medication, have experienced a crisis that makes it difficult to concentrate, be in physical pain, or have trouble understanding the language in which the assessment is conducted.Interview psychometric testing At some stage of your job search it’s likely you’ll be asked to undertake a psychometric test.
It can seem daunting but by understanding the pros and cons of psychometric testing you’ll have a. Psychometric properties are those aspects of a test or a measure that say how good the test or measure is.
They deal with things like the reliability and validity of a measure. How accurate is it at measuring a construct and does it.
Jul 01, · Using Brain Imaging Measures in Studies of Procognitive Pharmacological Agents in Schizophrenia: Psychometric and Quality Assurance Considerationsbut avoids any pitfalls associated with an inaccurate prediction of the location of brain activity changes in response to the intervention.
Summary. Associated with Using Psychological Measures in the Multicultural South African Context Alaina Kamille Govender University of Kwa-Zulu Natal South Africa is deeply embedded in the roots of its past and so it inevitable that psychological assessment today would be greatly influenced by the history of our country.
Using Psychometrics – The Pitfalls For HR. When using psychometrics the pitfalls for HR departments can unexpectedly call into question (often by the hiring managers) questions around how well does the assessment meet the relevant work performance criteria.
Free Essay: The Major Pitfalls (Historical and Current) Associated with Using Psychological Measures in the Multicultural South African Context Alaina.Download