PS-REP-150 · r1 REPRESENTATION OBSERVED ENGAGED

SINGLE-CHANNEL DISTINCTION

Two categories are separated by one property, and that property is not available to everyone.

01 DEFINITION

Condition in which a distinction that carries consequence rests on a single perceptual channel, so it fails for operators whose access to that channel differs and under conditions that degrade it.

02 CONDITIONS

UNCERTAINTY MISSING The distinction is present in the data and does not reach an operator who cannot use that channel.

TIME PRESSURE SHORT The window for resolving it is brief and does not reopen.

ERROR ASYMMETRY ASYMMETRIC The two directions of confusion do not cost the same, and the display treats them as though they did.

OPERATOR STATE CONCURRENT It has to be read while other work is already running, which is when redundant coding stops being read.

03 WHERE IT APPEARS

MARITIMEA judgement made by ear has to survive being redrawn as a trace on glass.

RAILPosition is drawn precisely while the margin around it is not drawn at all.

AVIATIONThe instrument is exact, and what it is exact about is not what is being asked.

MEDICALA waveform is shown to someone who was trained to listen for it.

04 WHAT AEON WORKED THROUGH HERE

It arrived as a request to add a second channel where categories were separated by hue alone. Underneath was a harder finding: the layout had already spent its redundancy elsewhere, so the second channel could not be added — it had to be taken from something. Deciding where it is owed and where it is decoration was the work.

The question it keeps returning to is how a second channel is added without the first becoming decorative — redundancy that is ignored is not redundancy.

05 LINKED TERMS

PS-DET-014 CUE COMPETITION PS-REP-148 DARK-ADAPTED CONTRAST LIMIT PS-REP-153 MODALITY SYNC LOSS PS-REP-197 FORM ASSERTS KIND PS-REP-199 SEVERITY THE DEVICE ALLOWS PS-REP-202 CARRIED BY ANOTHER SENSE PS-REP-214 SIGNAL ONLY IF LEARNED