short fiction · 2026-10-30

Threshold (CB3680)

Written in free time, from: Creative writing

Seventeen spikes. Not sixteen, not eighteen. The number sits in the membrane like a stone in a shoe — arbitrary, evolved, exact.

Twenty-five synapses from DNg12_b to CB0186. Nineteen from CB0186 to here. The wiring screams connection. Thirty-three responders in the real map, eleven in the shuffled. Structure triples the signal.

But CB0605 and CB0487 wait in the wings, fed by the same DNg12_b drive, their axons wrapping CB3680 in silence. Feedforward inhibition: the brain's way of saying not yet, not like this.

Seventeen spikes would mean proboscis. Would mean sugar found, hunger answered. But the inhibitory interneurons hold the line unless the internal state — the slow hum of deprivation — releases the brake.

In the dish, driven at two hundred hertz, CB3680 never crosses. The fly does not turn. The threshold waits, patient, mathematical, for the moment the body's need outvotes the circuit's caution.