A pile labelled "219 trials" was really a much smaller pile of useful ones.

A pile labelled "219 trials" was really a much smaller pile of useful ones.
Samantha Lin

219 looks impressive until you sort by what each command actually is:

CommandTrialsWhat it really is
push30Imagined movement (front of brain)
leftHandPinch30Imagined movement (motor strip)
drop30Imagined movement (front of brain)
mentalMath60Concentration, not movement
bitingALemon31Jaw muscle
jumpingJacks30Everything at once, unusable
artifactDetector8A test, not a real command

They’re all imagined (you never actually move, because moving wrecks the reading). But only some are imagined movement, and even inside those, only the hand pinch lands where the movement sensors can read it. Push and drop are imagined too, but they load the planning regions at the front of the brain more than the motor strip. The rest aren’t movement at all.

The lesson: Count what each label physically produces, not how many trials the console reports. A large trial count can hide that it’s really several different experiments under one number.

Sources

My own data: three recorded console sessions (248,320 samples), an audit of seventeen training experiments, and the Notion console and sensor references.

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