Skill · Shadow Hand
Pinch
Thumb and index fingertips meet in a pinch only while the “pinch” pathway is ON.
Runs on the Shadow Hand · Dexterous hand
01 Pathway
How the neurons drive it.
A pathway is one cue: the electrode we pulse, the electrodes we read, and the rule that decides when it is ON. This skill has one.
“pinch”
- Pulse electrode
- 50at 10 Hz
- Read electrodes
- 41 42 49 51 57 58 59
- ON at
- 0.6spikes per electrode per 100 ms
We pulse electrode 50 at 10 Hz. When electrodes 41, 42, 49, 51, 57, 58 and 59 average at least 0.6 spikes per 100 ms, and twice the rate of the rest of the array, “pinch” is ON.
These are the skill file’s starting electrodes, numbered column by column across the 8 × 8 array. Calibration moves each pathway onto electrodes your culture actually answers on and raises its ON threshold above resting noise.
02 Movement
What the Shadow Hand does.
Target pose “pinch”
- thumb rotate
- 0.45 rad
- thumb flex
- 1 rad
- thumb hub
- 0.2 rad
- thumb bend
- −0.2 rad
- thumb tip
- 0.2 rad
- index spread
- −0.15 rad
- index flex
- 1.3 rad
- index curl
- 0.9 rad
03 The test
Moves only while cued.
Pulse ‘pinch’ from 1 s to 4 s: thumb and index should pinch only while pulsed.
It passes when
- 01Pinches while pulsed
- 02Open before pulses
- 03Opens after pulses
04 Proof
Proof it is the neurons.
Validation replays this test three times on the same spontaneous activity. The skill counts only if it passes with stimulation and fails under both controls; if it also passes without the neurons, it is marked invalid.
05 More skills
Shadow Hand
Train “Pinch” on the Shadow Hand.
Choose a biocomputer, launch, and watch it calibrate, train and validate.