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Rasch analysis examining processing mechanisms of the object location memory test revised.

Tracy L Kline¹, Karen M Schmidt

¹University of Virginia, 102 Gilmer Hall, P.O. Box 400400, Charlottesville, VA 22904-4400, USA. tlk7n@virginia.edu

Journal of Applied Measurement

|September 30, 2005

Summary

This study developed the Object Location Memory Revised (OLM-R) to assess spatial memory. Object manipulation and array size significantly impact performance on this new memory assessment tool.

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Area of Science:

Cognitive Psychology
Neuroscience
Psychometrics

Background:

Spatial memory is crucial for navigation and daily functioning.
Existing tools for assessing spatial memory may have limitations.
The Object Location Memory Revised (OLM-R) was developed to address these limitations.

Purpose of the Study:

To construct and validate the Object Location Memory Revised (OLM-R) instrument.
To examine the psychometric properties of the OLM-R using Rasch methodology.
To identify factors influencing performance and item difficulty on the OLM-R.

Main Methods:

Development of the Object Location Memory Revised (OLM-R) instrument.
Administration of the OLM-R to 111 participants.

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Analysis using Rasch methodology and regression analyses to assess measurement properties and influencing factors.

Main Results:

The OLM-R demonstrated good overall measurement properties, despite one misfitting item.
Object Manipulation (e.g., moving, replacing, unchanging items) was a key factor influencing performance.
The Number of Items within the spatial array also significantly affected OLM-R performance.

Conclusions:

The Object Location Memory Revised (OLM-R) is a promising instrument for measuring spatial memory.
Object manipulation and the complexity of the spatial array are critical determinants of performance.
Further refinement of the OLM-R may enhance its measurement precision.