Semantic
What to express, and when. Five principles from the main study (n=47).Every MUST guardrail comes from here.
Five principles
sp.1Context decides meaningThe same nod means "yes" after a question and "hello" at a first meeting. 49% read a nod as a greeting.Derived ruleEvery behavior has a trigger and a forbid condition
sp.2Not looking broken comes firstIrregular tremor, oversized motion, sudden acceleration. Perceived malfunction × overall rating r = −0.80 (pilot −0.76).Derived ruleNo tremor · size limit · repeat twice
sp.3One meaning per motionNod (yes) and bow (greeting) are both up-down, so they are often confused.Derived ruleConfusable pairs differ in at least one of direction, start pose or timing
sp.4Body carries intensity; face and sound carry good or badGesture alone conveys arousal but not valence. Sad → laughing 32%, fear → sneering 32%.Derived ruleNegative emotion uses 2+ channels including face or sound. Otherwise do not express it.
sp.5Start, stop, returnWithout a stop at the end it reads as "still going". 34% read pointing as "looking around".Derived ruleEnd hold 0.3–0.5 s · repeat twice · return to rest
From principle to rule
The principles are the grammar. The rules that the generator checks are derived from them.
Principles become checks
- Every MUST guardrail (gr.*) names the principle it comes from — SP-1 to SP-5.
- Token combination rules (HARD H1–H7, SOFT S1–S3) add how tokens may be put together.
Don’t
Don't Act Without ContextA behavior without a trigger and a forbid condition is not generated (SP-1).
Don't Look BrokenIrregular tremor, oversized motion and sudden acceleration read as a malfunction (SP-2).
Don't Show Negative Emotion With the Body AloneNegative emotion needs face or sound as well; otherwise it is not expressed (SP-4).