The symptom you describe is not classic for any of the common presentations for ALS or Parkinson's. Intermittent toe extension can sometimes signify an old injury to the nervous system, but without other symptoms it would be impossible to speculate as to the cause.
What I would recommend is that you see a neurologist. Hopefully they will be able to see the movement and decide what testing needs to be done. They can also test the function of the toe and the nerves serving it.
I was afflicted with Guillain-Barre Syndrome 25 years ago as a child. I thought I was fully recovered, however, perhaps this is associated with my intermittent toe extension? Something in the general category of post-Polio Syndrome?
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