Does Stroop color-word test performance predict cognitive decline or dementia?
Answered November 2, 20264 sources
EvidenceCLimitedStudies in people with real weaknesses: small, short or conflicting trials, or observational studies only.
People with mild memory-related cognitive impairment do worse on Stroop-type tests than healthy people. No study has shown that one person's Stroop score predicts later decline or dementia.
- Who it's for
- Clinicians assessing people already worried about memory; not shown to forecast risk in healthy adults.
- What to expect
- A moderate group difference, but only a modest ability to tell impaired from healthy.
- Watch out for
- A single score can't predict your future.
Each dot shows the average gap versus healthy people, with a line for its likely range where the source gives one.
- Stroop-type interference control−0.74Range not reported
- Response inhibition−0.71Range not reported
- Inhibition of cognitive sets−0.76Range not reported
| Result | Estimate | 95% range | Reading |
|---|---|---|---|
| Stroop-type interference control | −0.74 | not reported | Range not reported |
| Response inhibition | −0.71 | not reported | Range not reported |
| Inhibition of cognitive sets | −0.76 | not reported | Range not reported |
Source 1 Neuropsychol Rev, 2020
What the studies show
- A meta-analysis A study that pools the results of several earlier studies into one overall estimate. It is usually the strongest kind of evidence. pooled 70 comparisons covering 2,184 adults with amnestic mild cognitive impairment (a memory-led stage that often precedes Alzheimer's disease) and 3,049 healthy adults. People with impairment did worse on inhibition tasks, a moderate-sized gap. Interference tasks like Stroop showed the same moderate gap1.
- In that review, the Stroop result depended on whether reaction time or accuracy was measured, and on whether people came from clinics or the community1. This design compares groups at one point in time. It cannot show that a low score came before the decline.
- A study of 97 older adults at a memory clinic tested an eye-tracking version of the Stroop. Its scores correlated moderately with the paper version and with other thinking tests. It separated people with dementia from those without only fairly well (an AUC of about 0.71, where 0.5 is a coin flip and 1.0 is perfect)3. This was a single-time-point test of current status, not a forecast.
- A small study of 18 people with probable Alzheimer's disease found more errors on eye-movement inhibition tasks than in healthy older adults. The errors tracked with dementia severity4. This was a different task from Stroop, in a small group, measured at one time.
- The study authors note that frontal lobe problems have been reported to predict the shift from mild impairment to dementia3. That is background in an introduction, not a finding from Stroop testing.
Key studies
| Study | Who | What it found |
|---|---|---|
| Review of 70 comparisons, 20201 | 2,184 with mild impairment, 3,049 healthy | Moderate inhibition deficit, including Stroop-type tasks |
| Study at one point in time, 20263 | 97 older memory-clinic patients | Eye-tracking Stroop separated dementia only fairly well |
| Study at one point in time, 20054 | 18 with Alzheimer's, 35 healthy | Eye-movement inhibition errors rose with dementia severity |
What we don't know
- Whether a Stroop score in someone with normal thinking predicts who will develop dementia years later.
- Whether adding Stroop to other memory tests improves forecasts of decline.
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Written by AI from the studies listed, without review by a clinician, and graded with the GRADE method. It can be wrong, so check the studies it cites. Education, not medical advice.