Reverse King-Devick Test and History of Multiple Concussions
Public ClinicalTrials.gov record NCT04560400. Field values are reproduced from the official study page; the official ClinicalTrials.gov record remains the source of truth for eligibility, enrollment, and contact information.
Data is sourced from official ClinicalTrials.gov public API records. Always review the official ClinicalTrials.gov record for the latest information.
Official title
Effects of Reading Direction and History of Multiple Concussions on King-Devick Test
Brief summary
Reproduced verbatim from the official ClinicalTrials.gov record. Not medical advice.
The purpose of this study is to examine the effects of concussion history and reading direction on baseline King- Devick Test (KDT) performance, a common component of sideline concussion assessments. The KDT is a timed assessment of saccades, or quick movements of the eyes between two points. This test is a form of rapid automatized naming and involved subjects reading digits arranged on a tablet screen as quickly and accurately as possible. The test has three progressively more challenging test "cards," as the horizontal guidelines between digits disappear from test card 1 to 2, and the vertical spacing between the lines of digits decreases from test card 2 to 3. KDT performance is evaluated in terms of both speed (duration to all three test cards) and the number of errors (digits read incorrectly or omitted). Previous studies have identified several factors that affect KDT performance aside from head injury, including age, sex, sleep deprivation, learning disabilities, and first languages other than English. History of concussion has not been shown to influence KDT performance. The investigators hypothesize that since the left-to-right (L-R) reading direction of the KDT is the same way in which to read English, the long-term effects of prior concussions on saccadic eye movements may be masked. The investigators want to answer the following three research questions: 1) What is the effect of KDT reading direction on baseline KDT performance? If the test is performed by reading digits in a right-to-left (R-L) direction, will KDT times be slower and the number of errors increase relative to a typical L-R KDT? 2) What is the effect of a history of multiple concussions on KDT performance relative to no history of concussion? 3) Is the R-L KDT more sensitive to a history of multiple concussions? The investigators hypothesize that individuals with a history of multiple concussions will perform significantly worse (longer test durations, more errors) than individuals with no concussion history on the R-L KDT. On the other hand, the investigators hypothesize that baseline performance on the traditional L-R KDT will not be able to discriminate individuals with a history of multiple concussions from those with no concussion history.
Study identification
- NCT ID
- NCT04560400
- Recruitment status
- Completed
- Study type
- Interventional
- Phase
- Not applicable
- Enrollment
- 71 participants
Conditions and interventions
Conditions
Interventions
- Conventional King-Devick test Diagnostic Test
- Reverse King-Devick test Diagnostic Test
Diagnostic Test
Eligibility (public fields only)
- Age range
- 18 Years to 26 Years
- Sex
- All
- Healthy volunteers
- Accepts healthy volunteers
This page does not interpret eligibility. Detailed inclusion and exclusion criteria are on the official ClinicalTrials.gov record.
Study timeline
- Start date
- Sep 19, 2020
- Primary completion
- Apr 30, 2022
- Completion
- Apr 30, 2022
- Last update posted
- Feb 22, 2023
2020 – 2022
United States locations
- U.S. sites
- 1
- U.S. states
- 1
- U.S. cities
- 1
| Facility | City | State | ZIP | Site status |
|---|---|---|---|---|
| Indiana University School of Public Health | Bloomington | Indiana | 47405 | — |
Site contact phone numbers, emails, and investigator names are intentionally not displayed here. Open the official ClinicalTrials.gov record for site contact information.
About this trial record page
- What this page shows
- Public field values for ClinicalTrials.gov record NCT04560400, including study identification, conditions, interventions, eligibility (age, sex, healthy volunteer), timeline, and U.S. site list.
- What this page does not do
- No medical advice, eligibility judgments, treatment recommendations, study quality scoring, or AI-generated medical summaries. No site contact phone numbers, emails, or investigator names.
- Where the data comes from
- Sourced from the official ClinicalTrials.gov public API. The official record is the source of truth.
- Last refresh
- Last update posted Feb 22, 2023 · Synced Sep 9, 2026
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Open the official record
The complete protocol, eligibility criteria, and contact information for NCT04560400 live on ClinicalTrials.gov.