Use when
- The method includes transfer, restraint, placement, scoring, or repeated operator contact.
- Sessions span multiple days or operators.
- The endpoint is sensitive to arousal, freezing, latency, exploration, or movement.
Experimental Confounds
Experimental confound
Handling
Handling can change stress, arousal, compliance, and task engagement, making it a protocol variable rather than a background detail.
Decision summary
Standardize handling whenever behavior is sensitive to arousal, novelty, or operator interaction. Report who handled subjects, how often, and how handling was balanced across groups.
| Protocol variable | Acclimation schedule, transfer method, restraint, and placement. |
|---|---|
| Affected endpoints | Latency, freezing, distance traveled, grooming, and zone time. |
| Control action | Balance operator, order, cage, and handling exposure. |
| Audit field | Handler identity, session order, and deviations. |
Do not use when
- Handling differs systematically between groups or time points.
- Operator identity is confounded with treatment, room, sex, cage, or session order.
Caveats
- Repeated handling can reduce novelty response but also introduce learning or habituation.
- Different handlers can unintentionally apply different transfer or restraint methods.
- Handling effects can persist into later tasks in a battery.
Reporting checklist
- Describe acclimation and handling schedule.
- Report transfer and restraint methods.
- State whether handlers were balanced or blinded.
- Report session order and time from handling to testing.
- Document deviations, escapes, failed transfers, or excessive restraint.
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.
