Measurement notes
Score slips from a fixed camera view and preserve whether the animal stops, turns around, freezes, or falls. Normalizing slips by steps or traverse length helps when speed or completion time differs between groups.
Endpoint methods library
Skilled walking endpoint
Beam walk foot slips
Number or rate of paw slips while an animal traverses a narrow beam or balance beam under a defined scoring rule.
Unit
count or slips per step
Readout
Count or rate of paw slips during a completed beam traverse
Assays
Balance beam, ledged beam, skilled walking, stroke recovery, ataxia, Parkinsonian models
Decision summary
Use beam-walk foot slips when the question is about skilled stepping, balance, or subtle sensorimotor impairment. The endpoint is strongest when beam dimensions, traverse direction, paw-slip definition, training, and video angle are consistent.
| Primary value | Count or rate of paw slips during a completed beam traverse |
|---|---|
| Common units | Foot-slip count, slips per step, slips per traverse, or percent error |
| Compatible assays | Balance beam, ledged beam, skilled walking, stroke recovery, ataxia, Parkinsonian models |
| Required boundary | Beam dimensions, slip definition, traverse criterion, and scoring window |
| Do not infer alone | Pure coordination, proprioception, weakness, or motivation without traverse context |
Interpretation limit
More slips can support impaired balance or skilled stepping, but beam aversion, poor training, low motivation, visual deficits, paw injury, sedation, and different traverse speeds can produce the same pattern.
Data capture
Store animal ID, beam width, beam shape, trial number, traverse time, step count, slip count, fall count, turnarounds, pauses, camera angle, scorer ID, and exclusion flags.
Confound checks
- Beam width, height, texture, or lighting differs between sessions.
- Animals pause, turn, cling, or jump instead of traversing.
- Training exposure or home-cage motivation changes traverse strategy.
- Video angle hides hind-paw slips or side-specific errors.
- Weakness, pain, sedation, or visual impairment changes stepping independent of balance.
Reporting checklist
- Beam dimensions, surface, height, goal box, lighting, and habituation procedure.
- Trial count, training schedule, traverse definition, and timeout rule.
- Foot-slip definition, whether slips are forepaw, hindpaw, or total, and scorer blinding.
- Normalization method: raw count, per step, per distance, or per completed traverse.
- Handling of falls, turnarounds, pauses, incomplete trials, and grooming.
- Companion endpoints such as traverse time, step count, gait, rotarod, or distance traveled.
References
Evidence notes
Endpoint pages should cite the method literature behind the scored value and keep high-specificity protocol claims qualified unless the source supports them.
- Brooks SP, Dunnett SB. Tests to assess motor phenotype in mice: a user's guide. Nat Rev Neurosci. 2009. doi:10.1038/nrn2652.
- Geyer MA, Dulawa SC. The behavioral assessment of sensorimotor processes in the mouse: acoustic startle, sensory gating, locomotor activity, rotarod, and beam walking. NCBI Bookshelf.
Related workflow paths
Endpoint articles link to adjacent products, software workflows, and sibling endpoints where the connection is useful and already routable.
