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digital-drosophila/registry/catalog-20260929/evidence/phase4y-dpm-hypothesis/audit/MECHANISM.md
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Phase 4Y — paired whole-brain effects

All branches are diagnostic hypotheses; none is selected as a better biological model.

KC condition late spike range paired change range decreases / unchanged / increases
59832 DPM_fast_current_off 0–0 -17–-13 12 / 0 / 0
59832 DPM_fast_current_reversed 0–0 -17–-13 12 / 0 / 0
59832 frozen_reference 13–17 0–0 0 / 12 / 0
78836 DPM_fast_current_off 0–0 -40–-39 12 / 0 / 0
78836 DPM_fast_current_reversed 0–0 -40–-39 12 / 0 / 0
78836 frozen_reference 39–40 0–0 0 / 12 / 0
82312 DPM_fast_current_off 60–61 -1–1 1 / 3 / 8
82312 DPM_fast_current_reversed 60–61 0–1 0 / 4 / 8
82312 frozen_reference 60–61 0–0 0 / 12 / 0
KC isolated DPM-off range whole-brain DPM-off range (same old seed)
59832 0–0 0–0
78836 14–16 0–0
82312 60–61 60–61
population condition mean late spikes mean late active neurons
DAN_annotation DPM_fast_current_off 1935.58 46.33
DAN_annotation DPM_fast_current_reversed 1665.33 32.92
DAN_annotation frozen_reference 5646.83 130.50
DPM DPM_fast_current_off 156.00 2.00
DPM DPM_fast_current_reversed 140.33 2.00
DPM frozen_reference 376.58 2.00
KC DPM_fast_current_off 61.42 1.33
KC DPM_fast_current_reversed 61.75 1.42
KC frozen_reference 116.33 3.50
MBON DPM_fast_current_off 1535.25 34.17
MBON DPM_fast_current_reversed 1339.33 24.33
MBON frozen_reference 5414.83 52.00
MBON_downstream DPM_fast_current_off 134299.42 2198.08
MBON_downstream DPM_fast_current_reversed 133019.67 2173.58
MBON_downstream frozen_reference 169223.08 2546.42
PN_annotation DPM_fast_current_off 64262.58 552.75
PN_annotation DPM_fast_current_reversed 64220.58 552.75
PN_annotation frozen_reference 64375.00 554.00
all DPM_fast_current_off 499695.83 9760.00
all DPM_fast_current_reversed 493479.00 9579.75
all frozen_reference 568869.75 10768.08
descending DPM_fast_current_off 10421.50 189.33
descending DPM_fast_current_reversed 9995.50 187.00
descending frozen_reference 12229.33 205.25
motor DPM_fast_current_off 11036.42 200.42
motor DPM_fast_current_reversed 10971.92 200.58
motor frozen_reference 10895.08 186.33

Whole-brain feedback is allowed to respond; isolated replay holds the other recorded arrivals fixed. A difference between them is the target of the experiment, not grounds for choosing one result. Input matching is at the scheduled request level. Accepted new PN spikes can differ through feedback-dependent refractory state; see input-request-vs-acceptance.parquet. Do not claim identical delivered PN spike trains. Descending/motor rows here use populations-corrected.parquet, reconstructed from saved full counts and verified actual superclass names. The original zero-population rows are retained but invalid; see audit/population-schema-correction.json. No learning, no reward events, no parameter fitting, no promotion; smaller late activity is not itself success. Biological signs and long-term stability remain unproven.