Psychometric Properties of Visual Object and Space Perception (VOSP) in Healthy, Older, Thai Adults: A Pilot Study
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Abstract
BACKGROUND: Visual Object and Space Perception battery (VOSP) complies a series of tasks comprehensively represent object and space perception abilities. However, VOSP has not been validated in Asian population.
OBJECTIVES: This study aimed to obtain preliminary normative data relating to VOSP for older Thai adults and to identify the demographic variables influencing their scoring performance on each VOSP subtest. Furthermore, the practicality and convenience of VOSP focusing on testing time, appropriateness of image size, and clarity of images and instructions was also investigated.
METHODS: After getting written permission from Pearson Education Ltd. to translate VOSP, the Incomplete Letters subtest in Thai alphabets was created and linguistic validation of VOSP instructions was done. Forty healthy, older, Thai adults were recruited and stratified into 8 groups by age, gender, and education. Performance of the participants on each VOSP subtest scores, testing time and clarity of each VOSP subtests stimuli and instructions were demonstrated by descriptive statistics. Multiple linear regression analyses were performed to identify potential significant contributions of demographic variables to the VOSP subtest scores performances.
RESULTS: The preliminary scores for each VOSP subtest were comparable with those from other normative studies, except the Silhouettes and Object Decision subtests. Gender, intelligence quotient, and visual acuity had significant effects on certain VOSP subtest scores. Mean total testing time was 18 minutes. Most rating scores of image size and clarity of images and instructions of each VOSP subtests were indicated good to excellent quality.
CONCLUSIONS: Overall, the preliminary scores of each VOSP subtests in healthy Thai older adults were comparable with the other normative studies. The findings of this study will benefit future national normative study planning in non-native English-speaking countries.
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References
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