Experimental Confounds
Confound

Habituation

Habituation controls how novelty, handling, chamber exposure, and apparatus context affect behavioral readouts.

Decision summary

Treat habituation as a design variable whenever novelty or handling can change the measured behavior. It should be planned, not patched after the data look noisy.

Affected endpointsLatency, freezing, locomotion, zone time, withdrawal response, and exploration.
PreventionStandardized room, handler, chamber, apparatus, and timing exposure.
Detection symptomHigh within-group variability, freezing, escape behavior, or unstable baselines.
ReportingDescribe exposure duration, setting, and whether habituation was repeated.

Use when

  • The endpoint can be altered by novelty, stress, freezing, exploration, or escape behavior.
  • Animals must enter chambers, mesh floors, arenas, mazes, or restraint contexts before testing.
  • Repeated testing or baseline sessions are part of the design.

Do not use when

  • The method intentionally measures novelty response and the protocol defines that exposure.
  • Extra exposure would train the animal on the task and invalidate the endpoint.
Caveats
  • Habituation can reduce novelty-driven noise but can also train animals if overused.
  • Species, strain, sex, housing, and prior testing can change the habituation need.
  • Changing habituation after seeing data creates analysis bias.
Reporting checklist
  • Report room acclimation and apparatus acclimation separately.
  • State duration, number of sessions, and interval before testing.
  • Describe handling and transport procedures.
  • Report whether habituation was identical across groups.
  • Explain any animal excluded for persistent stress or escape behavior.
References
Percie du Sert et al. 2020. The ARRIVE guidelines 2.0.
Supports transparent reporting of procedures and design variables.
https://pubmed.ncbi.nlm.nih.gov/32663219/
Deuis, Dvorakova, and Vetter 2017. Methods used to evaluate pain behaviors in rodents.
Discusses behavioral-method conditions and interpretation constraints.
https://pubmed.ncbi.nlm.nih.gov/27776118/

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.

Behavioral endpoints

Concept page for endpoint boundaries.

Electric Von Frey apparatus

Product method context where chamber habituation affects response scoring.

Mechanical withdrawal threshold

Endpoint guide for the readout affected by acclimation.