Developing Psychophysical Measurement of Working Memory
Kata Kunci:
Measurement, Psychophysical, Test Construction, Working MemoryAbstrak
This experimental research aims to develop a valid and reliable working memory measurement instrument based on psychophysical and computerized characteristics. The authors developed a measuring instrument for working memory capacity, including speed, space or capacity, and energy measurements. We used the Opensesame application from Cogsci.nl to develop a measurement instrument with a paradigm based on the conceptual definition of working memory capacity, such as: speed, space or capacity, and energy. The samples in this study are determined by using the Disproportionate Stratified Random Sampling technique, to obtain a representative sample based on different strata of academic qualification levels. This research involved 93 undergraduate students as the respondents. The Rasch analysis shows the reliability coefficient of the test items is 0.9066 and 0.9295 for the person reliability coefficient, this indicates that the items in the test are reliable. The number of strata as an index of item variation in this measuring instrument also shows a coefficient of 4.4870 at the item level and 5.1743 at the person level, which meets the criteria for a good variation index. On the other hand, Item Response Theory analysis shows the mean value of parameter-a or item discrimination level about 0.210, while the average value of parameter-b or item difficulty level is -1.32 with medium difficulty category.
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