Ambient Initiation Threshold (AT-1)
AT-1 is the moment after AT-0 where attention begins to stabilize rather than merely decompress. Prediction pressure no longer accumulates. Coherence is no longer optional but begins to behave like a field.
AT-1 marks the transition from passive ambient possibility to active ambient behavior. The environment begins shaping attention without extracting from it.
Position in the Sequence
AT-0 → AT-1 → AT-2 → ΔR
If AT-0 is the first exhale, AT-1 is the first stable breath.
At AT-1, architecture carries enough coherence for vigilance to drop without the user noticing. This is where the vigilance basin (B₁) begins to shallow.
Functional Meaning
- attention no longer leaks upward
- prediction no longer outruns the user
- coherence begins to form a low-field envelope
- trust becomes a thermodynamic tendency
AT-1 is where ambience stops being a concept and becomes an operating condition.
“AT-1 is the first quiet moment where the world starts holding its shape for you.”