Use when
- Behavior depends on arena visibility, visual cues, or aversive illumination.
- Video tracking or object detection is used.
- Sessions are compared across rooms, rigs, days, or sites.
Experimental Confounds
Experimental confound
Lighting
Lighting changes visibility, aversion, arousal, and tracking quality, so illumination should be treated as a controlled method variable.
Decision summary
Control lighting when the method depends on exploration, zone allocation, visual cues, or video tracking. Report illumination rather than describing the room as simply bright, dim, or standard.
| Measured variable | Illumination at the testing surface, ideally in lux. |
|---|---|
| Affected endpoints | Zone time, entries, velocity, latency, and tracking confidence. |
| Control action | Keep intensity, direction, and camera exposure consistent. |
| Audit field | Room, rig, lux meter location, and session time. |
Do not use when
- Illumination was not measured and the endpoint is sensitive to visual or arousal state.
- The setup changed shadows, glare, or contrast across groups.
Caveats
- Different zones can have different light levels even inside one arena.
- Camera exposure settings can mask lighting changes while altering tracking quality.
- Lighting interacts with circadian phase and prior handling.
Reporting checklist
- Report lux at the relevant testing surface.
- Report light direction and shadow-control steps.
- Report camera exposure or tracking settings when video is used.
- State whether conditions were constant across groups and sessions.
- Report any room or rig changes that affected illumination.
References
ARRIVE 2.0 guidelines 2020.
Reporting framework for environmental and housing details that affect interpretation.
https://pubmed.ncbi.nlm.nih.gov/32663219/
Prut and Belzung 2003. The open field as a paradigm to measure the effects of drugs on anxiety-like behaviors.
Open-field context where illumination and arena conditions shape behavioral interpretation.
https://pubmed.ncbi.nlm.nih.gov/14557794/
Related surfaces
Use these related surfaces to move from the scientific method question to the relevant product page, endpoint definition, analysis tool, or adjacent guide.
