K-D; K-D test
The King-Devick Test (K-D) is a brief, rapid number naming test that evaluates neurologic functioning through the use of eye movement speed. The K-D consists of one demonstration card and three test cards. The cards each consist of single digit numbers with variable spacing between them. Participants read each card from left to right, row by row, as fast as possible without making errors. Each successive card increases in difficulty, as the spacing between numbers becomes less regular and therefore more visually challenging, particularly the last card in which the numbers are more crowded together. The time for each card is recorded and then summed to create total K-D score. The test generally takes less than 2 min to administer. A higher total K-D score, reflecting more time to read the cards, indicates worse performance. It requires minimal training to administer.
The K-D was originally created to assess reading ability (King...
References and Readings
- Fayyaz T., Edwards J., Scull L., Ayaz, H., Shewokis P., Libon, D., Deboo, A., & Heiman-Patterson, T. (2014, April). Cortical hemodynamics assessment in ALS during cognitive testing using functional near infrared spectroscopy. Poster Presentation at American Academy of Neurology 2014 Annual meeting. Philadelphia.Google Scholar
- Galetta, K. M., Barrett, J., Allen, M., Madda, F., Delicata, D., Tennant, A. T., Branas, C. C., Maguire, M. G., Messner, L. V., Devick, S., Galetta, S. L., & Balcer, L. J. (2011). The King-Devick test as a determinant of head trauma and concussion in boxers and MMA fighters. Neurology, 76(17), 1456–1462.PubMedPubMedCentralCrossRefGoogle Scholar
- Galetta, K. M., Liu, M., Leong, D. F., Ventura, R. E., Galetta, S.l., & Balcer, L. J. (2015). The King-Devick test of rapid number naming for concussion detection: Meta-analysis and systematic review of the literature. Concussion. https://doi.org/10.2217/cnc.15.8
- King, A.T., and Devick, S. (1976). The proposed King-Devick test and its relation to the pierce saccade test and reading levels (Senior research project). Chicago: Illinois College of Optometry.Google Scholar
- Raynowska, J., Hasanaj, L., Zhang, I., Serrano, L., Birkemeier, J., et al. (2015). Agreement of the spiral-bound and computerized tablet versions of the King-Devick test of rapid number naming for sports related concussion. Annal Sports Medical Research, 2(9), 1051.Google Scholar
- Spradley, B., Wiriyanpinit, S., & Magner, A. (2014). Baseline concussion testing in different environments: A pilot study. Sport J. Published online March 12. [cited 2018 January 24]. Available from http://thesportjournal.org/article/baseline-concussion-testing-in-different-environments-a-pilot-study/