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The Severity-Calibrated Aphasia Naming Test
Grant M Walker1, Julius Fridriksson2, Argye E Hillis3
1Department of Cognitive Sciences, University of California, Irvine.
American Journal of Speech-Language Pathology
|November 4, 2022
Summary
The Severity-Calibrated Aphasia Naming Test (SCANT) offers a reliable and valid 20-item measure for aphasia severity. This naming test effectively predicts overall aphasia severity, serving as a proxy for comprehensive speech assessments.
Area of Science:
- Neurology
- Speech-Language Pathology
Background:
- Aphasia, a communication disorder resulting from brain damage, requires accurate severity assessment for effective treatment.
- Comprehensive aphasia test batteries are time-consuming and resource-intensive.
Purpose of the Study:
- To introduce and validate the Severity-Calibrated Aphasia Naming Test (SCANT) as a proxy for aphasia severity.
- To establish the SCANT's reliability and validity against established aphasia measures.
Main Methods:
- Developed a 20-item SCANT from a larger set of 174 pictures using lasso regression.
- Validated the SCANT with 200 participants with left-hemisphere stroke and 20 healthy controls.
- Assessed interrater reliability, test-retest reliability, sensitivity, specificity, and external validity.
Main Results:
- The SCANT demonstrated extremely high interrater reliability and strong sensitivity and specificity for detecting aphasia.
- SCANT predictions of aphasia severity were superior to predictions from the full set of naming items.
- Using SCANT requires approximately 15% more participants than a full test battery to achieve equivalent statistical power.
Conclusions:
- The SCANT is a reliable and valid tool that can serve as a proxy for aphasia severity.
- A linear model and a change score cutoff of four items are provided for converting SCANT scores to aphasia severity scores.
