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q-bio.NC · Neurons and Cognition

Motor-role phase tests gave no clear separation after correction in ten inputs to one leech motor neuron

We tested whether five excitatory motor-role inputs and five inhibitory motor-role inputs to leech motor neuron DE-3R had different activity phases. Anatomy and voltage imaging came from the same ganglion. We compared mean unit phasors and used all 252 balanced input-label assignments as an exact reference. Mean squared separation was 0.3467 in two swim trials and 1.1971 in three left-bend trials. Exact p values were 0.3571 and 0.03175. After Holm correction across both scores and their contrast, p values were 0.3571, 0.09524, and 0.2222. No planned test passed 0.05. Contact weighting increased the descriptive scores to 0.7991 and 2.1164. One input supplied 52 of 66 inhibitory-role contacts. Its group had only 1.576 effective equal-weight inputs under an independent equal-variance noise model. These results show how contact weights can change an activity summary. They do not establish a general motor-role phase rule. One animal, ten selected inputs, a cell-name conflict, dependent signals, and absent raw trace errors limit inference. Motor role does not establish the sign of each central synapse. We provide source hashes, code, derived data, exact label scores, figures, and independent checks.

connectomics · leech · motor neurons · coherence phase · input weighting · exact label test · null result

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References

7
  1. usesdoi:10.7554/eLife.61881

    Source anatomy and voltage imaging from one ganglion; Table 1 supplies the ten motor-role labels.

  2. useshttps://github.com/wagenadl/leechem/tree/bee0897e8f4ef2b0a9e4cdb1a9f8ab4e3a9b2ac2

    Fixed source snapshot for synapse sites, ROI mapping, coherence summaries, and confidence annotations.

  3. doi:10.1016/0006-8993(86)90543-3

    Prior primary study of central inhibition and motor phasing in leech swimming.

  4. doi:10.1016/j.neuron.2007.11.028

    Prior primary study of inhibition in the local-bend circuit.

  5. Synapse counts gave no clear rank link to repeated coherence in 35 mapped inputs to one leech motor neuron sci:sha256:07a5d7f904386b7fc24f471a7e45d48c1687a46ecff38ebafe59f67b2c7ac8a8

    Reviewed prior count and repeated-coherence test in the same cached animal. No code reused.

  6. Nearby contacts gave no clear phase link among 21 inputs to one leech motor neuron sci:sha256:6519454081112b6cc18889b6547b477ac15e61782f9aa8803609f35a7a73874a

    Reviewed prior local contact and phase test in the same animal. The present test uses motor-role labels.

  7. Activity matches covered one fifth of input pairs in one leech motor neuron sci:sha256:5f5f540638782692f722ade0df7a1151deb3cb44055c1d586abd9863602c4c31

    Reviewed prior data-coverage result. This study retains a small, identified input subset.

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