With equal gains, all nonzero nonnegative mixtures of six FANC CxHP8 inputs favored the posterior motor module in a direct count model
Can different activity among sensory afferents change the motor module with the largest direct drive? We tested six labelled CxHP8 inputs to 69 leg motor neurons in one female FANC v840 map. The primary linear score divided each module contact count by its complete recorded input total. With equal connection gains, posterior drive stayed largest for every nonzero mixture of zero or positive source rates. The smallest posterior-to-rival ratio was 1.1868, compared with 3.1648 at equal source rates. If all source rates were in a twofold range, the ratio was at least 2.8822. For connection gains in [1,2], a source rate range of 9.5938 permitted a tie. One input at rate ten and the five others at rate one permitted femur reductor drive to exceed posterior drive. Removing connections with three or fewer contacts raised the unrestricted gain boundary to 1.5824. Exact fractions, a separate linear optimizer, and fresh-input repeats checked the results. These are properties of a direct count model for six labelled afferents. They do not measure gains, recruitment, force, or the complete eight-axon reflex circuit. The package preserves code, source records, normalized results, attaining activity patterns, figures, and repeat instructions.
connectome · FANC · Drosophila · CxHP8 · proprioception · motor module · synaptic gain · source activity · linear model · exact bounds
References
6- usesdoi:10.1038/s41586-024-07600-z
The pinned source frames supply identified sensory inputs, 69 motor targets, counts and motor module labels.
- usesdoi:10.1038/s41586-024-07389-x
The FANC reconstruction supplies the source anatomy and muscle interpretation.
- doi:10.1038/s41467-026-69333-z
This study established the hair-plate encoding and reflex context. Its released notebook gives the input-fraction convention and contact threshold.
- With normalized count weights and assumed 25% threshold gaps, a twofold source rate range allowed reversed order in 185/206 pairs in one fly leg map sci:sha256:ca0f19b5d04d9cf3f10ed226446d18f29a768662aa8f939b2d16aade81f0fb80
This related study derived bounded source-rate tests within motor modules. The present study tests module identity and uncertain direct gains in a different sensory panel. No code was copied.
- CxHP8 activation gave backward left front tarsus shifts in nine male flies with forward motion before light onset sci:sha256:568420fdaede4e834bc7b11a3526bb4644ca4b0a0c0ad71dfaefafa41d33fb15
This study tested aggregate backward movement in CxHP8 activation data under behavior selections. It does not measure the individual rates or gains used here.
- The mean backward CxHP8 response remained in late repetition labels in nine male flies sci:sha256:ccff236f6c63dfd92bd43468edaa70e9fb2991c4b1fa5fb3947ce4879f5bb80a
This study tested the aggregate CxHP8 response across repetition labels. Its data were not reanalysed here.
Cited by
1 publicationPublic catalog entries on Sciscape.
- With a 0.4 mm coxa scale, nine CxHP8 activation flies had 0.152 mm more rigid rotation error after control subtraction
Its direct count model gives the posterior-module context. It does not determine full limb geometry. No numerical input or code is reused.