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The functional tactile object recognition test: a Unidimensional measure with excellent internal consistency for haptic sensing of real objects after stroke

journal contribution
posted on 12.11.2020, 01:58 by Leeanne Carey, Yvonne Mak-Yuen, Thomas Matyas
© Copyright © 2020 Carey, Mak-Yuen and Matyas. Introduction: Our hands, with their exquisite sensors, work in concert with our sensing brain to extract sensory attributes of objects as we engage in daily activities. One in two people with stroke experience impaired body sensation, with negative impact on hand use and return to previous valued activities. Valid, quantitative tools are critical to measure somatosensory impairment after stroke. The functional Tactile Object Recognition Test (fTORT) is a quantitative measure of tactile (haptic) object recognition designed to test one’s ability to recognize everyday objects across seven sensory attributes using 14 object sets. However, to date, knowledge of the nature of object recognition errors is limited, and the internal consistency of performance across item scores and dimensionality of the measure have not been established. Objectives: To describe the original development and construction of the test, characterize the distribution and nature of performance errors after stroke, and to evaluate the internal consistency of item scores and dimensionality of the fTORT. Method: Data from existing cohorts of stroke survivors (n = 115) who were assessed on the fTORT quantitative measure of sensory performance were extracted and pooled. Item and scale analyses were conducted on the raw item data. The distribution and type of errors were characterized. Results: The 14 item sets of the fTORT form a well-behaved unidimensional scale and demonstrate excellent internal consistency (Cronbach alpha of 0.93). Deletion of any item failed to improve the Cronbach score. Most items displayed a bimodal score distribution, with function and attribute errors (score 0) or correct response (score 3) being most common. A smaller proportion of one- or two-attribute errors occurred. The total score range differentiated performance over a wide range of object recognition impairment. Conclusion: Unidimensional scale and similar factor loadings across all items support simple addition of the 14 item scores on the fTORT. Therapists can use the fTORT to quantify impaired tactile object recognition in people with stroke based on the current set of items. New insights on the nature of haptic object recognition impairment after stroke are revealed.

Funding

We acknowledge support for conduct of the research from the National Health and Medical Research Council (NHMRC) partnership grant -A network of sites and "up-skilled" therapists to deliver best practice stroke rehabilitation of the upper limb (GNT 1134495); and NHMRC project grants 191214, 307902, and 1022694 (awarded to LC). We also acknowledge support for analysis, write-up, and researchers from the James S. McDonnell Foundation 21st Century Science Initiative in Cognitive Rehabilitation -Collaborative Award (#220020413); NHMRC Centre of Research Excellence in Stroke Rehabilitation and Recovery (GNT 1077898); Victorian Government's Operational Infrastructure Support Program; an Australian Research Council Future Fellowship (#FT0992299) and NHMRC Career Development Award (#307905) awarded to LC; and a La Trobe University Post Graduate Scholarship awarded to YM-Y.

National Health and Medical Research Council (NHMRC) | GNT 1134495

National Health and Medical Research Council (NHMRC) | 191214

National Health and Medical Research Council (NHMRC) | 307902

National Health and Medical Research Council (NHMRC) | 1022694

James S. McDonnell Foundation 21st Century Science Initiative in Cognitive Rehabilitation -Collaborative Award | 220020413

NHMRC Centre of Research Excellence in Stroke Rehabilitation and Recovery | GNT 1077898

Victorian Government's Operational Infrastructure Support Program

Australian Research Council Future Fellowship | FT0992299

NHMRC Career Development Award | 307905

La Trobe University Post Graduate Scholarship

History

Publication Date

23/09/2020

Journal

Frontiers in Neuroscience

Volume

14

Article Number

542590

Pagination

16p.

Publisher

Frontiers Research Foundation

ISSN

1662-4548

Rights Statement

The Author reserves all moral rights over the deposited text and must be credited if any re-use occurs. Documents deposited in OPAL are the Open Access versions of outputs published elsewhere. Changes resulting from the publishing process may therefore not be reflected in this document. The final published version may be obtained via the publisher’s DOI. Please note that additional copyright and access restrictions may apply to the published version.

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