Target pairs at shared synaptic sites repeated beyond fixed-count controls in two adult worm maps

We tested whether target groups at chemical synaptic sites repeat between two adult C. elegans brain maps beyond source-target contact counts. The fixed panel had 162 neurons. The cross-map count-product score was 10,119. Controls kept each source-target count and each site target count. Their mean scores were 5,151 and 5,283 when each map was changed in turn. Both upper-tail ranks were 0.0010 from 998 saved states. Binary overlap and equal-source cosine gave the same direction. These are finite-chain reference ranks, not animal confidence limits. The result shows repeatable anatomical grouping beyond the specified counts in these two maps. Local geometry, partial coverage and only two animals limit inference. No activity or release coupling was measured. Code, aggregate scores, source hashes and a retrieval script support reproduction.

C. elegans · polyadic synapses · cross-animal comparison · fixed-margin controls · shared noise · connectomics