Modified feedback-control task for examining the relationship between sense of agency and motor control: a pilot study.
Yu Miyawaki, Takeshi Otani, Shu Morioka
PMID 31164779WHAT IT FOUND
Healthy adults traced a line more accurately when the cursor showed their own movement.
In one group, fake cursor errors exceeded no-feedback errors in the last cycle. No patients were tested.
Key findings
01When participants saw their own cursor, their tracing error was smaller than when they saw a fake cursor or no cursor.
02In the group shown its own earlier movement as fake, the fake-cursor error was larger than the no-cursor error in the last cycle.
03The group shown its own earlier movement as fake reported more fake-as-self confusion in the fake condition (mean 1.9) than the group shown another person's movement (mean 0.6).
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
The study tested 24 healthy adults, not patients with movement disorders. The task was a laboratory tracing task, not a clinical treatment or functional outcome. The findings only partly matched the earlier study, because the no-feedback pattern differed and the subjective ratings showed an extra group effect. The authors say it is unclear how many practice trials patients would need to become familiar with the task. The validity of the 9-point self-other rating scale needs further study.
Declared interests
The authors declare no competing interest.
The easy way to misread this
Do not read this as evidence that a feedback task improves motor control in patients. It tested 24 healthy adults performing a simple tracing task, and the modified task only partly matched the earlier laboratory findings.